RV

Have RV questions? Ask an RV mechanic online.

Ask an Expert,
Get an Answer ASAP!

My Cummins ISL 400 wouldn't start. Turned over but no

Customer Question
My Cummins ISL 400...

My Cummins ISL 400 wouldn't start. Turned over but no compression. Electric all good. Had mobile tech come out. After 5 trips.

Mechanic's Assistant: Have you checked the battery, particularly the terminal connections? Are they corroded?

Engine started last Sunday. Monday, wouldn't start. Tech checked pressure from electric lift pump and filters clear. All okay. He removed mechanical pump and cleaned the check valve before reinstalling. He pulled head off injector pump and found one of two pistons was not springing back up when pressed. To get it to start, he ordered & replaced that, put a new line from that head to the rail, new gaskets. Said the computer showed good pressure.

Mechanic's Assistant: What is the model/year of your RV?

I tried Cummins reprime 3 times, bumping starter 6-7 each time. Pulled line off "out" side of coarse/separator filter and had helper try to prime w key and bumping. Never got any fluid to come out of filter head. 2008 Country Coach Allure 470 38' Sunset Bay.

Mechanic's Assistant: Are you fixing your Country yourself? What have you tried so far?

See previous posts. I keep hitting the send button too soon.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I just need ways to DIY seeing if diesel is getting past two filters. That's all.

Submitted: 26 days ago.Category: RV
Show More
Show Less
Ask Your Own RV Question
Customer reply replied 26 days ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 26 days ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 2 days by:
3/28/2018
RV Mechanic: peterpete190, Auto Technician replied 24 days ago
peterpete190
peterpete190, Auto Technician
Category: RV
Satisfied Customers: 31,730
Experience: Over 17 years diagnosing and repairing various model vehicles.
Verified

Hi, my name is ***** ***** I will be happy to assist with this today.In some cases, I may need more info to assist better.I apologize for any delay.
I am here Sundays through Thursdays from around 5 am to 2 pm Mountain time.If you respond and I do not respond back right away I will do so as soon as I can.My info is somewhat limited on your model here but no one else has responded and would like to see if I can help here since your question has been sitting for so long.If at any time you feel that I cannot help with this please let me know.

Even though the pump was repaired partially this can still be a fault with the pump itself.It can fail internally causing no fuel like your seeing here.I have also seen issues with a restriction of fuel flow due to a pinched off fuel line leading from the fuel tank or the sock filter in the tank itself clogged up.If these have not been checked for any issues this needs to be done.If this was already done and found to be o.k. let me know.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service, your 5-star rating is appreciated ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.I work on delivering the best answer and help here but in some cases, it can be difficult to do without seeing the vehicle.

Thanks Pete

Ask Your Own RV Question
Customer reply replied 24 days ago
A friend helped me undo the line coming out of the secondary filter. While I worked the ignition key, he got a steady stream with just the electric lift pump operating. When I cranked the engine trying to start it, the cam should have been operating the mechanical pump. However, the stream never changed in force or amount. This leads us to pull the mechanical pump and visually examine it. To do that we’ll have to remove the hard fuel line. We’re reluctant to do that for fear it can only be used once (I was told). During one cranking after removing the filters and filling them completely, we got the engine to “cough” once and almost start but couldn’t repeat that. We also think there may be air in the system after the filters that’s preventing fuel draw, and we’re not sure how to get that air out. Any other help?
RV Mechanic: peterpete190, Auto Technician replied 23 days ago

Is there any way you can slightly pressurize the fuel from the tank maybe with some air pressure to force fuel into the pump to see if it starts then at all?

Let me know,thanks Pete

Ask Your Own RV Question
Was this answer helpful?
Ask peterpete190 Your Own Question
peterpete190
peterpete190
peterpete190, Auto Technician
Category: RV
Satisfied Customers: 31,730
31,730 Satisfied Customers
Experience: Over 17 years diagnosing and repairing various model vehicles.

peterpete190 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:

Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV.

DutchUSA

Highly recommend this RV expert. Prompt, good and detailed answers were given. Very willing to help with genuine concern. I will ask for him next time.

JackUSA

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 PElm 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.

PhilMarysville, 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.

CharlesWalnut 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!

SueCharleston, WV

< Previous | Next >

Meet the Experts:

gene

gene

RV Mechanic

1,100 satisfied customers

28 yrs exp in the industry

Nick

Nick

RVIA Certification

664 satisfied customers

5 years RV repair and reconstruction, Fleetwood RV Training course completion.

Steve F.

Steve F.

RVIA Certification

443 satisfied customers

Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant

Robert

Robert

RV Mechanic

12,591 satisfied customers

18 yrs. RV experience including Cummins North West, Country Coach, Monaco Coach - vendor certified.

Randall

Randall

RVIA Certification

12,274 satisfied customers

RVDA/RVIA Master Certified Technician with many years experience.

Wayne

Wayne

RV Mechanic

874 satisfied customers

Work on several type of Rv engine, Trans, brakes

Chris (aka-Moose)

Chris (aka-Moose)

RV Mechanic

456 satisfied customers

16 years of experience

< Previous | Next >

Related RV Questions
2007 Winnebago Tour, right side wall will not extend. Acts
2007 Winnebago Tour, right side wall will not extend. Acts like its still locked. Pump motor sounds loaded. Other two slides work fine … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,274 satisfied customers
We have just discovered that our battery charge is down to
We have just discovered that our battery charge is down to 11.3 volts and discharging.We are connected to 240 volts in a Margarat River caravan park and the battery should have been charged.i suspect … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
89 satisfied customers
Were are the ba. Where are the brakers for a bedroom on a
where are the brakers for a bedroom on a 1998 pace arrow vision … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
How often do you need to change the transmission oil.
how often do you need to change the transmission oil … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Just bought a 2018 Springdale Summerland 1750rd. Do I need
Just bought a 2018 Springdale Summerland 1750rd. Do I need trailed brakes added. Using a Toyota 4runner to pull with. … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,274 satisfied customers
Macerator fuse blows when trying to dump. Macerator fuse
Macerator fuse blows when trying to dump. Macerator fuse blows when trying to dump … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
Georgie Boy 2005 Cruise Aire xl Model 3890, where is the
Georgie Boy 2005 Cruise Aire xl Model 3890, where is the water pump located in the rig. I can hear the pump near the hatch where the water and sewer cponnection are made ,but can't fine the pump. … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
Two things—-tire pressure—lots of discussion about what it
Two things—-tire pressure—lots of discussion about what it should be—follow the sticker or the tire? … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
I lost the key to our motor home it is a 2009 Itasca is
I lost the key to our motor home it is a 2009 Itasca is there a way we can get anew key cut it is for the engine … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
Stabilizers not retracting. 2015 jayco greyhawk. Greyhawk. I
I detach theRetracting faceplate and unplugged it and I detached the house battery and I started the RV I've gone underneath the RV try to push up the staplers … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
I am replacing my house batteries in my 2007 Itasca Horizon
I am replacing my house batteries in my 2007 Itasca Horizon RV. Do you have a daigram to make sure I hook them up correctly? … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
1998 REXAL CLASS A RV ON FORD CHASSIS LEVELING JACKS NOT
1998 REXAL CLASS A RV ON FORD CHASSIS LEVELING JACKS NOT OPERATING … read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,274 satisfied customers
I have a dometic rm1350mbsx. The problem is frig works great
Good morning my name is Steve Griner. I have a dometic rm1350mbsx. The problem is frig works great on gas but nothing on electric. Checked the outlet we have power. Our closest repair tech is 2 hrs aw… read more
Randall
Randall
RVIA Certification
Vocational, Technical or Trade Scho
12,274 satisfied customers
I am in Nashville, TN, and have a broken driver's side
I am in Nashville, TN, and have a broken driver's side rear-view mirror. The Ford dealer says it is a Winnebago part and that they cannot replace it. How should I proceed? … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
The seat material seems to have melted and is pealing off,
The seat material seems to have melted and is pealing off, we were under the impression it was a tough material. Would you like me to sent you a picture? … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
Do u know anything about the shift point fix. Got something
Do u know anything about the shift point fix. Got something from Winnebago a while back but lost it … read more
Chris (aka-Moose)
Chris (aka-Moose)
RV Mechanic
Vocational, Technical or Trade School
456 satisfied customers
Bedroom window shade broke strings that open/close. We need
bedroom window shade broke strings that open/close. We need to replace strings and instructions on how ton restring … read more
Robert
Robert
RV Mechanic
Vocational, Technical or Trade Scho
12,591 satisfied customers
I have a 2017 Coachman Pursuit motorhome with a 5500
I have a 2017 Coachman Pursuit motorhome with a 5500 Cummings Onan generator. It only has 11.9 hrs. Readying MH for season and generator won't start. Tried holding the priming button down for 30 secs … read more
Hank F.
Hank F.
Service Technician
High School or GED
5,364 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