Today, I was leaving the store. Went to start my Z and it was hardly running? I had to limp it home! For the past 2 weeks, its' been running rough in the mornings but then clears up and runs fine? I think my fuel pump may have gone bad, what kind of fuel psi should it be runing when the engine is off and the key in on the ON position? Right now, i have nothing. I do have an aux. fuel pump that activates only during boost when i have my charger on. Now, i don't have the charger on. I grounded the aux. fuel pump and the car barley ran! IT has 80psi of fuel pressure with that unit runing, but the car runs like crap? Any suggestions?

 

if you have no pressure your pump or relay is shot..

 

Well, I just went out and got a relay, did not know which of the 5 it belong to? so by process of elimiation..........all relays were working. Still no psi. guess its hours under the car toinght.......wth a bum knee!! i JUST HAD KNEE SURGERY!!! now, i gotta get under the Z.....CRap! more and even more pain meds and maybe some cold ones

 

I feel for ya..Had knee surgery last year....just take lots of VICODAN...worked for me!

 

check the fuse by the battery

 

looked at that, looks fine! I really think it is the pump............???

 

as i found out after replacing my pump for no reason lol please check your wiring harness make sure your getting power there, my wiring went bad i didnt really check that and i decided to replace the pump (very very not fun work). make sure your getting the correct voltage

 

Great suggestion!..exhauste all other possibilities first , then have a go at the fuel pump!

 

YEP! IT was the fuel pump! I had 0psi with the key on/engine off. Now with the new pump, i have 60psi with the keyon/engine off Amost done!

 

glad you found the problem on ur car. bout to install my fuel pump too. its goin to be lots of fun

 

about 9 hrs of fun for me! course i had to work alone lol

 

d--m! 9 hours???got it down now dont ya

 

Yea, about 9hrs here too All by my slef. Well, now since I installed the 255l/hr fuel pump, I think my fuel psi reguator is bad? Fuel is comming out of the vacume source.

 

Took me 2 days the first time. I didnt work to hard and took breaks. But I had no clue.

Im about to do it again to put in a 255lph holley intake. I wish my block had a place for a mechanical pump. If so Id run one. I have the fuel tank and lines for a mechanical pump in the 84 to. Wish my 93 caprice lo5 had mechanical fuel pump place

 

9 hrs and then 2 days

this week guys hopefully my car is runnin....almost 2 weeks. im havin serious withdrawls

 

sometimes my fuel pump comes on, and sometimes it doesn't.... i have changed the relay, the fuse is good, the car is getting power to the back, where the pump is..... what could be the problem?

 

Scratch that reply..Edit...Fuel pump going SOUTH!!