trouble starting after sitting for a bit

[Archtoker420]

So my 99 yukon started a new issue today out of no where. After sitting for a bit like 30 min or more it has a hard time starting unless i gibe it gas. Starts right up as soon as i hit the pedel while cranking. Read somewhere it could be fuel pressure regulator? Any advice??

 

[Larryjb]

This sounds exactly how my father's Mercury behaved, and it was the FPR. Pull off the vacuum line from the FPR and take a gentle sniff. If you smell gasoline, the FPR is bad.

Larry

 

[Archtoker420]

Alright thanks. Is that something hard to replace or fairly simple?

 

[Larryjb]

I've never done it on the Tahoe, but I've done it on easily on my Lesabre and Mercury.

Do my sniff test first to make sure, then:


1) depressurize the fuel system (unscrew the plastic cap on the left side of the fuel rail).
2) using a rag and wearing goggles, depress the stem and hold until no more fuel comes out.
3) Place a rag under the FPR, remove the fuel regulator vacuum line, then, wearing goggles, remove the fuel regulator. (Once I did have some residual fuel pressure and it sprayed over me as little.) (I'm not sure about the Tahoe, but it's usually a bolt, then it just wiggles out)
4) Insert new FPR, reattach hose.

Larry

 

[Archtoker420]

Doesnt sound to bad. Just to be sure im looking at the right thing is ir located on top of the motor drivers side has a little hose coming off? I took the little hose and it smelled like fuel a little

 

[Larryjb]

Sounds like you found it. It shouldn't smell like fuel at all. What's likely happening is that the residual vacuum after shutting off is sucking still-pressurized fuel into the intake and flooding the engine. By pressing the gas pedal, it clears out the excess gasoline so it will start.

Larry

 

[Archtoker420]

Awesome. Ill post a pic to make sure but its raining as of now. Doesnt look hard if it is it. I appreciate your help man

 

[TigerEyz3]

On the 5.7 Vortec, the FPR is integral to the fuel spider. Meaning the upper intake has to come off and a new fuel spider assembly has to be installed. Not super difficult, but not just a simple FPR replacement as described above.

 

[Larryjb]

On the 5.7 Vortec, the FPR is integral to the fuel spider. Meaning the upper intake has to come off and a new fuel spider assembly has to be installed. Not super difficult, but not just a simple FPR replacement as described above.

Thanks for the heads up. I wonder if it's the same on the 5.3L? I hope not. I'm not sure about the 5.7 Vortec, but it wasn't all that nice removing the intake from my 5.3L.

Larry

 

[Archtoker420]

Where exactlty is the fpr? I dont even know where to look. Ill take a pic of what i thought it was as soon as the rain stops. But if someone could point me to wjere to look