fuel psi dropping

[mnstanggt]

cars been falling flat on its face at wot lately , bogging bad around town and popping out the exhaust when first started

i checked fuel pressure primes to 30, hold 30 at idle i pulled the vac line from fpr jumps to 40 if i rev car psi drops to 25 then stays at 28 psi after returning to idle
after car is off fuel pressure drops to 0 within 2mins
then i tried reving the car real slow and holding 2k rpm fuel pressure climbs to about 35 then drops right back off

fpr vac line has no gas in it no smell and was replaced less than 3k miles ago
fuel pump is original and has 94k miles on it

i tried two different gauges just to be sure it wasnt my gauge

 

[WhiteCobra95]

Sounds like a failing pump to me. As demand increases, the pump can't keep up with the flow and the pressure drops. That can kill your regulator over time, especially if it gets really bad.

 

[mnstanggt]

i actually have a brand new fuel pump in the garage, how bad is it to change out. do you just drop the tank and replace or is there more to it. fuel pumps probably the only thing ive never done to these cars

 

[revhead347]

Could be a clogged fuel filter too.

Kurt

 

[mnstanggt]

fuel filter was done less than 1k miles ago and the old one wasnt bad just changed it during a tuneup

 

[mnstanggt]

another symptom i forgot to mention is it chugs when on an incline with half tank or less. if im sitting at a light on an incline it barely idles, rpms fluctuate pretty bad. if its level ground rpms stay dead on

 

[revhead347]

Could be the sock on the fuel pump then too. Have to pull the fuel pump out to get to the sock, so you might as well change the pump if you're going to do that.

Kurt