90 525 fuel pump?

[troysmith]

i tested my fuel pressure by puting a T with a gauge on it on the line coming from the pump and it has about 36 psi and if i unplug the fpr (which is new) it goes up for a sec then back to mid 30s.. a while back the pump was noisey but i dont notice it now.. so do i need to replace the fuel pump? what pressure should i expect doing it like this

[sidewinder69]

Did you run the fuel tank down too low and starve the fuel pump?

Most pumps are liquid cooled...and if you were doing ahem..."spirited" driving with a low fuel level you could have damaged the pump.

It might have been noisy when the level was low, but if you have a full tank that could have made it stop.

[troysmith]

i have only run it down 1 time below about 1/8 tank( about 50 or 60 miles) but it was noisy for about 2 weeks and then seemed to quiet down.. i was just told that my sluggishness may be caused from low fuel pressure.. and so i tested it to be about 35 or 36 e34.com says replace it but its a little expensive so i wanted a few more opinions.. thanks

[sidewinder69]

Yeah, that's probably why you have surging problems when it's under a load.

Have you tried putting fuel injector cleaner into the gas? Maybe that could help. I know it does work if the injectors are gumed up.

[troysmith]

yea i used lucas injector cleaner it seemed to help a little..it seems like everything i do is changing it a little and im slowly getting it running right there are just several things wrong with the old dinosaur..

[sidewinder69]

You using premium fuel in it? Also you could look at your battery if it's old or not. When my battery died on me and I changed it out it seemed to help the sluggishness.

Although this other battery was completely dead so I don't recommend it if it's working properly.