How long to pressurize fuel line between uses 08 H2?
Thread Starter
|
Member
Joined: Aug 2013
Posts: 43
From: Florida
The statement of 49 psi as tested by the auto shop was key in run position but engine off. Sounds as though my pump is not only weak but that the check valve is bad since the fuel lines need to be completely repressurized after 4-5 hours of down time.
Thread Starter
|
Member
Joined: Aug 2013
Posts: 43
From: Florida
Definitely ACdelco. So far the best price I can find shipped is $240.78 with fuel level sensor for the MU1656 from RockAuto.
Senior Member
Joined: Feb 2016
Posts: 172
Pete responded to a question about a 2003 H2 and you asked about a 2008 H2, these are completely different engines.
My fuel pressure is 44 psi while driving and the truck runs fine, I'll look up the fuel pressure specs for the 08 6.2l engines.
If I remember correctly the 08 has a fuel pump control module which I think is a variable speed pump (PWM). I could be wrong, I'll look it up and see.
I'll run out and do a quick fuel pressure test,
Neal
My fuel pressure is 44 psi while driving and the truck runs fine, I'll look up the fuel pressure specs for the 08 6.2l engines.
If I remember correctly the 08 has a fuel pump control module which I think is a variable speed pump (PWM). I could be wrong, I'll look it up and see.
I'll run out and do a quick fuel pressure test,
Neal
Do you have any CEL's, or an intermittent service 4wd system?
Thread Starter
|
Member
Joined: Aug 2013
Posts: 43
From: Florida
Nope. Just gas smell at start up, slightly rough idle, weak psi, fuel lines lose all pressurization after 4-5 hours, etc; etc...
Senior Member
Joined: Apr 2010
Posts: 1,007
From: Deep South Louisiana
May be an injector leaking down into the intake, this would explain the gas smell at startup and the loss of pressure.
If it was the pump you would not get the rich smell at startup as the gas would just de-pressure to the tank.
Neal
If it was the pump you would not get the rich smell at startup as the gas would just de-pressure to the tank.
Neal
Thread Starter
|
Member
Joined: Aug 2013
Posts: 43
From: Florida
A leaking injector was my original thought which is why I brought my truck in for the leak down test. They wanted $$$$ to replace my injectors without knowing if that was my actual problem.
Thread Starter
|
Member
Joined: Aug 2013
Posts: 43
From: Florida
https://www-odi.nhtsa.dot.gov/acms/c...4V614-0055.pdf
Senior Member
Joined: Apr 2010
Posts: 1,007
From: Deep South Louisiana
If you can find someone with the correct scan tool they can perform an injector balance test. If there is a failing injector it may show up then.
You may even be able to let it sit for a few hours then pull the plugs and see if any are wet with fuel, its a long shot but if you have the tools to pull plugs you can do it yourself.
Injectors fail, get dirty, leak, etc....
If it cannot be found with the above tests then they may have to be pulled and checked or replaced.
Neal
You may even be able to let it sit for a few hours then pull the plugs and see if any are wet with fuel, its a long shot but if you have the tools to pull plugs you can do it yourself.
Injectors fail, get dirty, leak, etc....
If it cannot be found with the above tests then they may have to be pulled and checked or replaced.
Neal
Last edited by legerwn; Jul 3, 2017 at 09:47 PM.
Thread
Thread Starter
Forum
Replies
Last Post
garnaout
PRIVATE For Sale / Trade Classifieds
10
Feb 3, 2012 01:25 AM
Geraldo
PRIVATE For Sale / Trade Classifieds
5
Mar 26, 2011 01:16 PM
RealJeep
PRIVATE For Sale / Trade Classifieds
15
Jun 17, 2008 10:16 PM