Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

No fuel pressure? Replaced pump and filter. If I take line…

Customer Question
No fuel pressure ? Replaced...
No fuel pressure ? Replaced pump and filter. If I take line loose from filter it pumps fuel when I turn key on and when I turn it over. But I show no pressure at fuel rail fitting. Runs if I dribble fuel into tbody ?
Submitted: 2 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 54 minutes by:
1/19/2016
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 8,145
Experience: ASE Certified Master Technician
Verified

Disconnect the fuel line at the fuel rail and just before the filter on the engine side, then using air pressure of about 30 psi, blow through the line and feel if the air is making it through and if so, try it now after hooking the lines back up. If the air doesn't make it through the line, replace the line or find and repair the clog, kink, etc.

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Will do ! Seems like pressure is weak , hard to tell with no reading at rail.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Let me know if that don't fix it and if so remember to rate me well so I get the credit.

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Blew line out was good. Went to hook my pressure gauge back up and noticed my Schrader valve in gauge was gone. Lol. Anyhoot got 59 lbs fuel pressure. And spark still won't start.

Customer reply replied 2 years ago

No codes !

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Check if the spark plugs are gas fouled. Remove one and smell if it smells like gas.

If so, remove and clean or replace them all. usually carb cleaner works if they are still in good shape.

If they are ok, check the fuel injector fuse, then see if it will start for a few seconds with starting fluid. If so, it is probably an injector pulse missing. First make sure there is voltage to the fuel injectors with the key on run and start and if so check for a ground pulse while cranking at each injector. Other than that, it may be an internal engine problem such as a timing chain/belt.

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Replaced plugs and cap and rotor they were fuel soaked and cap and rotor had tremendous buildup. Anyway this truck hasn't run in years. Draining out old fuel as we speak. Once I get some known good fuel in it. Gonna do some more checking. Where is inj fuse ? I did notice while ckecking fuses btsi fuse is blown and it blows when I replace it. Could this cause no start.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I'll look that up, give me a few moments.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

The fuel injectors and the ignition are fed from the "ECM IGN" fuse.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

That fuse is in the I/P fuse block along with the ENG fuse which feeds the camshaft sensor and some other sensors.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

If they are just numbered they are fuse 10 and 5.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I believe that btsi fuse has to do with shifting out of park. But I will look.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Yeah, that is the shift interlock. can you shift out of park?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

I can shift out of park fine. All fuses are good except btsi. How do I see if injectors are firing. It sputters like it wants to start when I turnbit over.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

With a noid light while cranking. Disconnect the fuel injector and hook up the noid light and crank the engine. the noid light should flicker.

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Not familiar with this system where is injector or injectors ? Have noid lights ! Just don't know where to check ?

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

First of all, while I see if I an find a picture or diagram, when you checked that "ECM IGN" fuse did you actually test it for voltage with a voltmeter or 12 volt test light or did you just look at the fuse to see if it was blown?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

It appears to me that fuse has to be ok, cause it also feeds the ignition coil and you said the engine does start with dripping gas into it so it looks like the fuel injectors are under the intake manifold and hard to get to, so I don't know why you cannot check for an injector pulse on one of the fuel injector ground wires at the vcm (vehicle control module). Let me see where exactly tat is located.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Before I forget, here is the engine wiring diagram.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

The vcm is mounted on the passenger side of the engine compartment. It appears to be up at the right front corner, under the hood.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

now the difficult part is figuring out how to hook up that noid light while keeping the necessary wires still connected to the vcm so it powers up.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Try leaving all of the wires hooked up to the vcm and backprobing, that is sticking something in very small and metal into the back of one of those fuel injector ground wire connectors and then hook up the noid light to it and then to ground and then crank the engine and see if the noid light flashes. I would first make sure it has voltage on that connector to make sure you do have good contact. You should be able to see the noid light light up first when the key is just turned to run before start. Or double-check with a voltmeter or 12 volt test light. Let e know if you have a problem.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

You should be back though and check all of those fuses with a voltmeter or 12 volt test light cause the vcm could just have a bad fuse or no power to a fuse such as like when a fusible link burns up. Or a faulty ignition switch.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

If you can find a wiring harness to and from that sequential fuel injection unit, you may be able to unplug and test it there. I don't think you can reach the fuel injection unit though unless you remove the upper intake manifold and I don't think you want to do that just now.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I would try a used vcm before I even removed the intake manifold. It shouldn't cost more than $50 or so for a used one.

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Vcm ?

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I told you back at 10:46am, vcm (vehicle control module).

Now, what about the other question I asked you?

Did you actually test it for voltage with a voltmeter or 12 volt test light or did you just look at the fuse to see if it was blown?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Weird vcm info just came thru late I didn't see it sorry. Checked fuses with test light will swap vcm and let u know how it works out. Thank you sir

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

You are welcome...so you have a spare vcm?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Had to order one will be here Friday. Will let you know his it goes. Will it require reprogramming ? Or just install ? Thanks again.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Where did you order it from?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

You know there are 2 different 4.3l engines that were in those. The Knock Sensor module may have to be swapped over to the new vcm, it's located under a plate on the VCM and is retained by two Allen head screws.

When replacing the VCM, the new VCM will need to be programmed.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

This shows how to replace that module if it does have one,

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I don't have that procedure though. Did they ask you for your vin so they could program it before they shipped it out?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

No just asked for Id number on mod.

Customer reply replied 2 years ago

Yeah canceled the one I had ordered. You got a source that can send me a preprogrammed one ?

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

First of all which 4.3 is this? You can tell if it's the original engine, then look at the 8h digit of the vin, then tell me what it is. Also, since you already know the number off the module, what is it? How much was you going to spend on that module and why couldn't they program t?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

4.3 x 8th digit. Mod # ***** ccsc . $75. I live in a little town in the middle of nowhere yards here don't have the ability to repro.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Autozone has one for $136, I would ask them if they can program it, http://www.autozone.com/engine-management/engine-control-computer/chevrolet/s10-p-u-4wd/1997/6-cylinders-x-4-3l-sfi?filterByKeyWord=vcm&fromString=search

Why are you jumping to the conclusion that it needs a new vcm so quickly?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago
Ask Your Own Chevy Question
Customer reply replied 2 years ago

Sorry I thought that's where we were at together. I just pulled codes again just for giggles there is a couple codes for map which I assume was from me trying to start with. Intake tube off throttle body. But also has a p1351 ignition coil 1 and 4 control circuit high voltage. Going to back up go thruposts and make sure I covered everything.

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

What were the map sensor codes? Write them all down then clear them and read if any come back after you try to start it.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

How can your scan tool say ignition coil 1 and 4? Isn't there just 1 coil?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

how many volts do you have to the ignition coil pin wire with the key on run?

Ask Your Own Chevy Question
Customer reply replied 2 years ago

Will check when I can ! I shoved it outside. Lol got some other stuff to get caught up on. Hollar soon ! Thanks mike

Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Ok, that's fine.

Ask Your Own Chevy Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a chevy mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Mike S. Your Own Question
Mike S.
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 8,145
8,145 Satisfied Customers
Experience: ASE Certified Master Technician

Mike S. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,756 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,642 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,884 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,953 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,836 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Engine starts and runs for about 20 seconds thenbfuel shuts
Engine starts and runs for about 20 seconds thenbfuel shuts off ? If you crank it without shutting key off won't restart. But if you turnbkey off andbrecrank starts right up and runsbfor 20 seconds. W… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Have a 2004 Tahoe I just bought. It runs like new 30
Have a 2004 Tahoe I just bought. It runs like new for about 30 minutes. It then starts chugging at full throttle,and eventually will get where it won't rev over 3500 and will stall and die. Weird thin… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet Blazer: , I have a 2002 Chevy Blazer 4x4 LS that
Hi, I have a 2002 Chevy Blazer 4x4 LS that I am having a great deal of difficulty troubleshooting a fuel delivery issue. I do my own shade tree mechanic work but this one has me stumped. I have been g… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet 2004-1/2: starts ok cold. idle surges a little
starts ok cold. idle surges a little cold, not as noticable once warmed up. drive OK. accelerated OK. cruise OK, WOT lots of power, no smoke avg MPF about 19-20 @ 55mph If I shut it off for about 20 m… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet Suburban 1500 LT: Started my 2002 Suburban yesterday
Started my 2002 Suburban yesterday morning, rough start but it started. Eventually the idle smoothed out but then stopped. Would not start again. Turns over just fine, but will not start. Any ideas on… read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
Chevrolet Camaro IROC-Z: I have a 89 Iroc with 5.7 TPI. New
I have a 89 Iroc with 5.7 TPI. New fuel pump and filter. I'm getting fuel past the filter but none on the check valve on the rail. Car will run on starting fluid. Pump runs at start-up for 2 seconds. … read more
Clayso
Clayso
Shop Owner Master Technician
ASE Master Certified Automobile Technician
879 satisfied customers
Chevrolet 5500: I have a 2005 chev 5500 with a 6.6 Duramax
I have a 2005 chev 5500 with a 6.6 Duramax the head gaskets went had heads tested ok got it all done but won't start has pulse at inj but can't get fuel rail pressure got code p0090 with scanner on it… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
3500 pickup: vin 1gbhk39d97e104587 duramax 2007..scan tool..rpm
Vin 1GBHK39D97E104587 Duramax 2007 in a 3500 pickup, came to my shop dead/no run issue, 117,xxx miles automatic, scan and no codes, charge batteries good and spin, 143 psi common rail on Genisis scan … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
2004 chevy silverado 1500: the crank sensor..gets warm..cooled
I have a 2004 chevy silverado 1500 4x4, thats not running right, I replaced the crank sensor, and did not fix the problem. It does not act up till it gets warm, and then it will shut off and not start… read more
Dave Nova
Dave Nova
Chevrolet Technician
Associate Degree
7,092 satisfied customers
99 chevy: express van..van 1500..4.3l..no power and it had a miss fire
Help I have a 99 chevy express van 1500 with a 4.3l. The van has no power and it had a miss fire on #4 code and random. I did a full tune up on it and it took care of the missfire problem I then check… read more
Doug
Doug
Head technician
High School or GED
14 satisfied customers
96 impala ss: no fault codes, and the check engine light..few seconds
Hello, we have a 96 impala ss. There are no fault codes, and the check engine light does not come on while the engine is running, it does come on for a few seconds with the KOEO. After approx. 10 to 1… read more
Car Whisperer
Car Whisperer
Lead Technician/Shop owner
Vocational, Technical or Trade Scho
45 satisfied customers
2002 chevy s10: Replaced fuel pump..fuel filter , do we need..prime
2002 chevy s10 Replaced fuel pump and fuel filter , do we need to prime the system ? We do not have any fuel ,just dribbles out engine side of filter. truck does not start. any help is gratefully appr… read more
Hal
Hal
owner/service tech
Vocational, Technical or Trade Scho
848 satisfied customers
06 duramax that running real rough..next morning..wont start
I have a 06 Duramax that running real rough, and didn't start the next morning, changed fuel filter, and primed it, but it still won't start. what's the problem?… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
2000 Chevy Astro: towed..fuel filter (both ac delco..new battery..ecm
I have a 2000 Chevy Astro AWD. Immediately after buying it, strange things started happening ... it was a drizzly day out and the windshield wipers just stopped working (fuse is still good), then the … read more
Matt J
Matt J
Owner of Jones Automotive
Vocational, Technical or Trade Scho
1,000 satisfied customers
97 chevy: 4X4..the fuel filter, fuel pump..o2 sensor..injectors
I have a 97 chevy Z71 4X4 with a 350 engine. I have replaced the fuel filter, fuel pump, mass air flow sensor, bank 2 #1 o2 sensor, and the fuel relay. I can hear the fuel pump running when I turn the… read more
cartech
cartech
master tech
High School or GED
1,797 satisfied customers
duramax diesel..replaced and primed fuel filter..if the trucks cranks
06 duramax diesel turns over but will not crank. replaced and primed fuel filter with same results. if the trucks cranks, it takes several seconds turning the starter over.… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
Chevy: drove..I was on the freeway I..instrument lights..loose power
I drove my 02 Chevy Avalance down to the store this morning. When I was on the freeway I noticed that the instrument lights were blinking fast like I was loosing power. As I started to exit the freewa… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I have a 1996 Olds Achieva. It has a 2.4 liter engine.
I have a 1996 Olds Achieva. It has a 2.4 liter engine. When you turn the key on the fuel pump runs to pressurize the fuel rail as normal. The engine will start but imediettly quits. If you dont turn t… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x