Fuel pressure needs to be 55-62 psi so right there have problem with pump

Answered by Docfixit (expert)
18,615 answers provided

I just removed the fuel filter (no resistance, you can blow right through it) and using a hose and hose clamps hooked up the fuel pressure gauge directly to the fuel line coming from the fuel pump. We jumpered past the relay and the gauge shot up to about 90 psi and blew the hose off the gauge. Fuel pump and filter are out of the equation, both good. What happens after fuel is pumped up to the injector assembly?

Response from phillychavez
1 question asked

ck.the injecter fuse.

Answered by cadieman (expert)
2,925 answers provided

Checked every fuse and relay under the fuse box cover - all visibly OK and ohmed out OK. Swapped all identical relays and no change.

Response from phillychavez
1 question asked

u have some pressure so the pump is getting voltage so recheck the pump installion.if correct warrenty or replace the pump.a new part isnt allways a good part.

Answered by cadieman (expert)
2,925 answers provided

Pulled the fuel line on top where it goes into spider body and got about 90 psi and no bleed down. If there's 20 psi at the Schrader check port then it sounds like pressure relief valve is wide open and bleeding off through the return line. Blew air through the spider body fuel inlet orifice and it came out the return orifice. Bought a new valve and will install tomorrow.

Response from phillychavez
1 question asked

BAD PRESSURE RELIEF VALVE (which you have to pull all the sensors, brackets, plugs, bolts,nuts, etc. off the plastic plenum [and the plenum] to get to the injector "spider" to change it). The small "O" ring on it was GONE. A new relief valve and all the hassle of reassembly and it's up and running again. Would I love to meet a GM engineer in a dark alley...................

Response from phillychavez
1 question asked