Thread: Fuel pressure dropping

You can rule that out pretty easily by pulling the fuel rail, then priming the pump to see if any are leaking. Regulator, just pull the vac line and see if there's fuel in there. If not, probably pump. My suburban did the same thing before the pump died, I'd have to prime it a few times before cranking to get it to start, otherwise it'd take 5 seconds or so of cranking.

When it hard starts, is it just a like a stumble then stall type of start. Like it runs for maybe 1 second and dies just away.

Have you ever cleaned the throttle body?? Because that is the 04+'s biggest issue for hard starts.


I wouldnt buy new injectors at that mileage, they arent known for going bad unless one is just pissing fuel out all the time.

2004+ have a return-less style fuel system, there is no vacuum line on the regulator like a 95-03 motor.

If you are lucky the access panel is under the carpet in the trunk, it was removed sometime through the 2005 model year for whatever reason. 2005.5-2008 do not have the access panel and the tank would need to be dropped, unless you want to cut a hole in the trunk.

Damn '04+ with its weird fuel system and dbw. By remove the fuel rail, I mean take the fuel rail off the engine with the line attached, set it up on some cardboard or something, then turn the key forward to pressurize the rail and see if any of the injectors are leaking fuel. On the '97-03 there's 4 nuts, and 1 stud on top of the blower holding it on, not sure about yours but it should be similar.

Or just replace the pump, that's probably what's bad