How JustAnswer Works:

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

Ask Edward Your Own Question

Edward
Edward, ASE Certified Technician
Category: Volvo
Satisfied Customers: 2229
Experience:  I've had 10 years of experience on the car line at 2 Volvo dealerships, Quality level Volvo tech.
Type Your Volvo Question Here...
Edward is online now
A new question is answered every 9 seconds

We have fuel to the fuel rail but no fuel to the engine, what

Customer Question

We have fuel to the fuel rail but no fuel to the engine, what could be causing that?
Submitted: 6 months ago.
Category: Volvo
Expert:  Edward replied 6 months ago.

Edward :

Hello and thanks for your question. My name is XXXXX XXXXX X will do all I can to help.

Edward :

Let me first ask, do you have injector pulse when cranking?

Edward :

You need a noid light, or a 12 volt test light wired between the two pins in the injector harness.

Edward :

Also, Turn the Key ON, and do not attempt to crank. Does the check engine light come ON in the instrument panel. It should turn ON with key ON and go out when cranking.

Edward :

Hello

Edward :

Do you have fuel pressure at the rail?

Customer:

Before we changed out the fuel pressure regulator it did not, and was not getting fuel. When we changed the pressure regulator we have fuel but did not check pressure

Edward :

Just turning the key ON, should give you 40 psi at the fuel rail.

Edward :

Do you hear the pump come on briefly for a few seconds when you cut the key to the ON position?

Customer:

yes, the pump turns on

Edward :

alright, I feel that it has ample pressure to the fuel rail then.

Edward :

But, It really needs at least 35 psi,

Edward :

verified with a fuel pressure gauge , because if it's less than 20 psi , it won't open the injectors. So it's tricky, because you can push the schrader valve and get fuel out, think it's enough, when it really isn't.

Edward :

Will it run at all?

Edward :

or just cranks and doesn't even try to run ?

Customer:

It will run for a few seconds if we put fuel in the throttle body

Edward :

I understand.

Edward :

so it does run with an alternative fuel source.

Customer:

yes

Edward :

Here is what I would do first in that case, we know it's firing the plugs, and it's not getting fuel.

Edward :

Get a noid light, and check for injector pulse when cranking. a noid light plugs directly into the fuel injector harness. and when you crank the engine, the light should blink. it looks like this.

Customer:

Yes

Edward :

you can do it with a 12 volt test light, but, you have to rig your light in the injector harness with some jumper wires or paper clips, so a noid light is easier.

Edward :

You just want to make sure the light flickers indicating the injector is getting power and ground. it should blink when cranking.

Edward :

You can have fuel pressure, but if the injectors aren't pulsing, your not getting any fuel into the combustion chambers. follow me on that?

Edward :

It's either not got enough fuel pressure, or it's lost injector pulse, one or the other, since it runs when you put fuel in the throttle body.

Customer:

the battery has been drained, would that have anything to do with it not running after we put fuel in the throttle body? we just did a quick charge on the battery

Edward :

Yes it could. ECM does need at least 10 volts to work right.

Edward :

Is the car cranking on it's on now?

Edward :

If it is, it should have enough voltage ?

Edward :

Do you have a fuel pressure gauge by chance?

Customer:

No, we had to rent one

Edward :

alright, how much pressure do you have at the rail with key on engine off?

Edward :

Do you still have it? ]

Customer:

no we don't, but we can rent it again. Could some of the injectors be clogged to where it is getting fuel but not enough

Edward :

OK, I doubt the injectors are stopped slam up, these are deposit resistant injectors. and the fuel filter is pretty big, so it's going to hold alot of junk before it clogged injectors completely up.

Edward :

Check for injector pulse when cranking, (since the fuel pressure gauge is not in your posession right now)

Edward :

You'll need a 12 volt test light or noid light to check for injector pulse.

Edward :

If it's got injector pulse, then I'm going to lean towards the fuel pump in the tank as being weak or failing, not giving you 35-40 psi at the rail.

Edward :

If it does NOT have injector pulse, then I would say the ECM is bad. because we know it's got spark, so it should have injector pulse.

Edward :

I'm leaning towards the fuel pump in the tank,

Customer:

How do you test the fuel pump with the fuel pressure test kit?

Edward :

You check for power to the pump, and if it's got power to the pump and no fuel pressure, you know either your pump has failed, or the fuel filter is stopped completely up. I doubt the filter is stopped completely up.

Edward :

This all wheel drive XC?

Customer:

yes it is a xc. we tested the pump with the positive, negative charge and fuel shot out of it

Edward :

Alright, that's a good sign it's got pressure then.

Edward :

And you hear the pump cut on when you turn the key on correct? it does cycle on for a few seconds?

Customer:

Yes

Edward :

Alright, with a good charge then, get the fuel pressure gauge back on it, and make sure it's got at least 35 psi with key on engine off, If it's just got 20 psi or so, then it's a weak pump.

Edward :

Does the check engine light come on with key ON engine OFF?

Customer:

Yes

Edward :

Alright, then we know the ECM is getting powered up.

Customer:

What is the ECM

Edward :

Engine Control Module.

Edward :

Its located on the passenger side inner fender well. in a block box. It will say Bosch on it. Motronic 4.4

Edward :

It grounds the injectors, so if you have good fuel pressure, check for injector pulse when cranking, if you don't have injector pulse, then the ECM has most likely failed.

Customer:

okay and if we have injector pulse what next

Edward :

you either don't have enough fuel pressure, or you don't have injector pulse. because it runs when you put fuel in the throttle body.

Customer:

So the fuel pressure would be the fuel pump and the injectors would be the ECM

Edward :

that is correct.

Edward :

But you need a gauge to make sure it's at least 35 psi at the fuel rail with key on engine off. if it's 20 psi , thats not gonna work.

Customer:

So if the pressure at the rail is not at least 20psi at the rail then the pump is bad

Edward :

no it needs to be 35-40 psi,

Edward :

What I was saying is , if it is 20 psi, then the pump has failed. you want at least 35 psi.

Customer:

Okay

Edward :

I believe you'll find your fuel issue there. These ECM's don't usually fail, though I have replaced a few of them. It's not common.

Customer:

So now we at least have some ideas where to start instead of keep casing our tails.Thank you very much for the information, and if we are having any other issues is there a way to contact you directly through this site

Edward :

Yes, you can contact me directly when you log in , or ask for me by name in your question heading, also you can rate this chat, it will close this chat, then I click on Questions and Answer format, and then we can continue in the questions and answer format, its just not live chat, but we can do that until you get it resolved.

Edward :

If you want to do that, that is what I would suggest, I will click into questions and answer format once this chat is closed, and you log off and back in, and you should have an alert queing you to answer me in Q and A format.

Customer:

Okay, Thanks again Edward

Edward :

Absolutely, Thank you.

Edward, ASE Certified Technician
Category: Volvo
Satisfied Customers: 2229
Experience: I've had 10 years of experience on the car line at 2 Volvo dealerships, Quality level Volvo tech.
Edward and other Volvo Specialists are ready to help you
Expert:  Edward replied 6 months ago.
Thank you Leroy, have a good weekend.

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:

 
 
 
  • The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time! Paul M Corpus Christi, TX
< Last | Next >
  • The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time! Paul M Corpus Christi, TX
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
 
 
 

Meet The Experts:

 
 
 
  • Enes's Avatar

    Enes

    VOLVO Technician

    Satisfied Customers:

    4240
    15+YEARS WITH VOLVO AS THE MASTER VOLVO MECHANIC&Ase
< Last | Next >
  • http://ww2.justanswer.com/uploads/enesd/2009-12-27_031829_eneswork.jpg Enes's Avatar

    Enes

    VOLVO Technician

    Satisfied Customers:

    4240
    15+YEARS WITH VOLVO AS THE MASTER VOLVO MECHANIC&Ase
  • http://ww2.justanswer.com/uploads/IN/InTheIROC/2011-8-10_4561_5454.64x64.jpg Andy's Avatar

    Andy

    Volvo Expert Technician

    Satisfied Customers:

    3008
    One of only a handful of ACTUAL Volvo dealership technicians on JA, ASE Master Certified with L1
  • http://ww2.justanswer.com/uploads/VO/volvoexpert1/2012-6-7_32422_Billand54Merc2avitar3.64x64.JPG volvoexpert1's Avatar

    volvoexpert1

    ASE Certified Technician

    Satisfied Customers:

    990
    Volvo Master Technician with 15 years excusively with Volvos. Also ASE L1certified for over 10 years.
  • http://ww2.justanswer.com/uploads/dramey04/2009-08-31_234152__083109_1938a.jpg dramey's Avatar

    dramey

    ASE Certified Technician

    Satisfied Customers:

    663
    have worked on volvo's for 4 years and am a ase master mechanic. current shop foreman
  • http://ww2.justanswer.com/uploads/Barlogio/2009-06-17_004912_Copy_of_Picture_25.jpg Jim B's Avatar

    Jim B

    ASE Certified Technician

    Satisfied Customers:

    496
    40 years Import and domestic AAA Approved Shop owner 30 yrs
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    437
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    259
    Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing