99socalFRC

iTrader: (6)

Installed this pump about 4 months ago, it was problem free until recently. I was getting lean codes and couldn't find any vacuum leaks so I put a pressure gauge to the fuel rail and two different days only saw 28 PSI.

My first assumption is the pump is slowly dying, but a reputable performance shop told me something has probably come loose/ broken inside the tank.

What do you guys think is more likely to be the problem, just wondering if I should even bother dropping the tank without another pump ready to go. Trying to minimize downtime, but my experience with fuel pumps is minimal.

This is on a 2006 Trailblazer SS with a TVS1900 (just 6 PSI). Also what is the feedback on the 340? Good? Bad? Should I be looking at going back in with something else? Maybe the Walbro 400?

Thanks in advance.

HCI2000SS

iTrader: (2)

Was it 28 psi at idle or under hard throttle or what? I just had a huge issue with all this, and realized my pump wasn't big enough for one, and it was also sitting in the bucket wrong too

99socalFRC

iTrader: (6)

28 PSI at idle and with small revs in the garage.

HCI2000SS

iTrader: (2)

Yeah that's not good at all. Did you upgrade the wiring with the 340 pump?

99socalFRC

iTrader: (6)

No but the wiring on the TBSS is supposed to be pretty good, and it had no problems until recently.

HCI2000SS

iTrader: (2)

Hmmm....if the pump is bad then it sounds real bad since it's only at 28 psi at idle even

Exidous

iTrader: (11)

I'd give the wiring a look. Including the relay. Aeromotive suggests a 40amp relay and 10ga wire. I just installed mine with all that stuff and at idle its pulling 16 amps. Its a beastly little pump and more than enough for your setup.

I had a supra pump in before are it fried 14 ga wire. Gave me low pressure for a week then fully died.