180ls1

iTrader: (4)

Well 1998 formula loses power after 4k and pops like its lean. So i threw a guage on it and its at like 58psi during idle but if i stab the throttle and bring it past 4k or so the pressure drops quite a bit like down to roughly 15psi i dont really want to hold it there with the TB blade half open cause i dont want to lean it out bad.

So whats my issue? Fuel filter, fuel regulator, fuel pump anything else...?

I have been having a slight overcharging issue with my alternator when it is cold if that makes a difference but that clears up quickly. I doubt its the filter cause i replaced it about 10k ago and this problem came about pretty suddenly but ill throw a new one in there just for good maintenance.

01ssreda4

iTrader: (96)

Sounds like a failing pump to me.

LS1TA_956

iTrader: (1)

+1 on the pump

LS1121

iTrader: (17)

replace the fuel filter and test again. If it is the same then you need a pump.

180ls1

iTrader: (4)

Yeah I think my plan of action is to toss Another filter in there and see what that does since its so cheap and easy. From there I will move on to the pump or regulator.

LS1121

iTrader: (17)

I was having an issue with my car chocking at 3500 rpm's and I checked the filter.....I could not even blow thru it. It was 90% closed up. Do the filter first.

180ls1

iTrader: (4)

Oh wow yeah I'll for sure do that then. I'll be updating this thread with progress and let you all know what the problem was if your curious or to help others also.

180ls1

iTrader: (4)

well its not the fuel filter...

01ssreda4

iTrader: (96)

Because its the pump.

LS1121

iTrader: (17)

Now you need to make the choice of dropping the tank or cutting a hole above the tank so you replace the pump..........

180ls1

iTrader: (4)

why do you say the pump and not the regulator? Just wondering. I Would it be a good idea to put a new regulator in it while im in there or no?

yeah it will be the trapdoor method for sure since its already been cut when i bought the car. I also should have said i ran out of gas about a week or so ago due to my gauge being off if that would effect anything.

01ssreda4

iTrader: (96)

The regulator caps pressure, that's it. Pressure is normal until you demand a reasonable amount of fuel, that means the supply line is running dry because the pump cannot keep up.

LS1121

iTrader: (17)

Ahhhhhhhhh now I see. You ran the pump dry. I did that once........under warrenty and they replaced the pump for free and told me to never run it dry, that will kill the pump.

180ls1

iTrader: (4)

good stuff to know, thanks guys

180ls1

iTrader: (4)

new fuel pump is in and the car rips again. Thanks gentlemen.