fuel gauge/pump
 

Not 100% fi related but I feel the FI guys know the most about the fuel pump.

I installed the fbm pump and drove around on it for about a week before installing my turbo. No issues but I never had over half a tank and at one point was driving with my low fuel light on. It seemed to function fine. Now came time to finish the turbo install. I has just enough in the tank for the low fuel light to not be on and I needed to drain it for e85. Not wanting to fight the fuel pump housing and risk tearing the seal I pulled the other side off and hand pumped out 2 gallons or so until that side was dry. Car wouldn't start and fuel gauge read 1/4 tank. On the way to the dyno I put 12.3 gallons in and the gaspump stopped. I even tried it once more. Fuel gauge says 3/4. I filled up again after the dyno and on the drive home it moved the appropriate amount down for the hour drive. Ive checked the arrows on the housing and everything appears to be correct. Could pumping one side dry have caused it? Any ideas? Other than that car runs great.

If you perhaps hit the petrol pump float arm when pumping out the excess fuel you may have this issue. Maybe you jarred it. It's hard to tell but that's what basically dictates to petrol gauge how much petrol is in the tank.

I would give it a few fill ups to see if everything returns to a normal equilibrium, but my only guess is also that something is interfering with the fuel gauge float.

If its the float, he would have had to damage it on installation, as he said he pulled the opposite side and pumped out of there, unless he snaked a line in there so far and it hit the other side of the tank, over the hump in the middle lol.

Do as King Tut stated, give it a few fill ups before worrying.

He could have placed some wires in the way of the float during the fuel pump install and the range of travel just hadn't been impeeded until he drained the tank. He said he only installed it a week earlier.

Yeah I just meant that it was most likely during installation if its the float. I know when I put my DW pump in, that you need to make sure those wires are clipped back in or they will get in the way of the float sensor.

This was my thoughts too. The draining may have swung the arm to the point where its binding on something whereas before it never had been that low to previous bind on whatevers in the way. It it were me I would just pop the top on the pump housing to be sure nothing is binding. You don't necessarily need to take the sump all the way out.

I think it's pretty common, my fuel gauge does not work correctly after my shop installed my turbo kit and fuel pump. I still need to get it fixed.

It shouldn't be common - if its installed correctly there will be no issues.

This pump is so easy to work on too, literally just drop it right in. On my sti, you had to twist the fuel assembly out, and it was a PITA to try not to hit the float sensor with the way you had to install it lol

Fixxed it. Pump canister rotated when I tightened it. Oops.

Sent from my SAMSUNG-SGH-I747 using Tapatalk