Long cranking after sitting for a bit 04 Tahoe

[Stonefort]

Did a little research and searching but still have a question. I think the fuel pressure is bleeding off causing the long start after sitting sometimes. Is the device that prevents this in the fuel pump module for my 04 Tahoe? I assume if it is I need a new fuel pump module.

If so, thinking I should stick with Ac Delco fuel pump module. Thoughts?

Thanks guys!

 

[OR VietVet]

Does sound like that but could also be bleeding off at an injector as well. You can depressurize the rail and pull the rail with injectors and then turn key to KOEO position and can check to see if the rail pressurizes again and watch the injector tips for any fuel leakage. Should have no leaks. If the injector o-rings at the rail also do not leak then it is like the pump or the fuel pressure regulator leaking off. For flex fuel rig: https://www.rockauto.com/en/moreinfo.php?pk=438163&cc=1424247&jsn=924

Did you already do a fuel pressure test and then shut off key and watch to see if the pressure holds for at least a few minutes and does not bled off quickly?


We recommend that you put all your rig(s) info in your signature so we all don’t have to guess at year, make, model, engine size, trans, rear axle locker…….etc. While you may have posted pertinent info in your first post, you may forget to do it again and the info is needed by us anyway. Makes it way easier on all members that attempt to help, to have that info right up front. It is also recommended that you take a pic of your RPO codes, on the inside cover of the glove box, and post that image in your signature. All this info will greatly help those that will try to help with a problem.


If there is any other info, like upgrades, mods or recent mechanical/maintenance work done, that would be helpful in any post as well. Too many times a question is asked by the poster and after about 10 responses we find out that the poster has done recent work to attempt to fix the problem or work that was done that SEEMS not related to the problem.

 

[Stonefort]

@PNW VietVet

looking at the vin it looks like it's a flex fuel. Thanks for the info on that.. did not realize it was. I looked at the vin, there is a Z in the 8th position. Working on getting my signature fixed up..

 

[Stonefort]

@PNW VietVet HeHey do you know where the flex fuel pressure regulator is on this 04 tahoe?

 

[OR VietVet]

Here is a you tube video of location and replacement steps:

 

[Fless]

The Flex Fuel pumps are different from the non-Flex pumps. It sounds like you've figured out that yours is a FF, and you should have a sticker inside the fuel door that shows it's FF.

The original fuel cap was yellow for FF trucks, but may have been changed sometime over the years.

EDIT: look at your RPO sticker in the glovebox. L59 is the FF engine.

 

[Stonefort]

@Fless - Thank you for the RPO code. I confirmed it is a FF engine with your code. I didn't think it was because of no yellow cap or sticker on the fuel door.

@PNW VietVet - Thank you for that great video! Actually happy I found out it was FF engine because this is easier than the fuel pump module.....so long as it's not the injectors leaking down. Thanks again for the help.

 

[OR VietVet]

@Stonefort, you need to change the L69 to L59 in your signature. I have a 2005 Z71 that is not flex fuel and the 2002 LT I am selling is flex fuel and the RPO code in the 2002 is L59, like @Fless said.


My 2002 did not have a yellow cap on it when I bought it and I did replace with a new black cap over the time I have owned it but I know for sure that it is flex fuel.

 

[Stonefort]

@PNW VietVet - Thank you for the correction! That was a mistype by me. My RPO code in the glove box indeed states L59.

 

[OR VietVet]

We all get fat fingers sometimes. Trust me, the older you get the fatter the fingers get.

 

[Fless]

I may have missed it, but how did you determine that it's the FPR?

 

[Fless]

Did a little research and searching but still have a question. I think the fuel pressure is bleeding off causing the long start after sitting sometimes. Is the device that prevents this in the fuel pump module for my 04 Tahoe? I assume if it is I need a new fuel pump module.

If so, thinking I should stick with Ac Delco fuel pump module. Thoughts?

Thanks guys!

View attachment 259126

If you get as far as doing the fuel pump module, the FF pump is AC Delco MU2294 for your year. And if you do plan to replace it, let us know since there are a couple of related items you'll want to have on hand. Fuel tank strap bolts, tank straps if they're badly rusted, etc.

 

[Stonefort]

@Fless Ok sure will! Thanks for the suggestion and the part number for the fuel pump module. From my searching it really sounds like it's the FPR. I just ordered the ACDelco one on Rock Auto for the FF engine. Plan to do it as soon as it comes in. Looks like a really quick install. This weekend I am going to go ahead and do the fuel filter. Got an ACdelco FF fuel filter coming in at Orielly's tomorrow morning, store pick up.

 

[Fless]

Sounds good. Have a flare nut wrench handy for that fuel filter. And the fuel line disconnect tool that slides into the other connection.

 

[OR VietVet]

The FPR was a suggested area to look for the problem and is very inexpensive to buy and easy to replace. May not be the problem but unless he does all the other checks I was laying out it could be the problem and easy to do.

 

[Fless]

Let us know how it goes. Have you had a fuel pressure gauge on it yet to see how fast it leaks down?

 

[Stonefort]

We all get fat fingers sometimes. Trust me, the older you get the fatter the fingers get.

I'm 31 so with the mistypes so far...my typing will be illegible by the time I am 60.

 

[Stonefort]

Let us know how it goes. Have you had a fuel pressure gauge on it yet to see how fast it leaks down?

Is there a cheap fuel pressure gauge I can screw into the schrader valve on the crossover line? Something like this?

https://www.harborfreight.com/fuel-injection-pump-tester-62623.html

Sounds good. Have a flare nut wrench handy for that fuel filter. And the fuel line disconnect tool that slides into the other connection.

Do you happen to know the size on the flare nut wrench needed?

 

[Fless]

Is there a cheap fuel pressure gauge I can screw into the schrader valve on the crossover line? Something like this?

https://www.harborfreight.com/fuel-injection-pump-tester-62623.html



Do you happen to know the size on the flare nut wrench needed?

I don't know the flare nut size, but I'll take a look at my '04 and see if I can tell.

That one should work, but you can "rent" a fuel pressure gauge from some auto parts stores. Loan-a-tool. Basically you pay for it and if you take it back you get all of your money back.

 

[Fless]

On mine, the fuel line nut takes a 16mm wrench. The hex on the filter is too big for a 19mm, so I'm not sure what that one is.