fuel gauge/pump - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Reaper · 03-19-2014, 11:56 PM

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.

ecko04 · 03-20-2014, 09:06 AM

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.

King Tut · 03-20-2014, 11:29 AM

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.

xxscaxx · 03-20-2014, 12:11 PM

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.

King Tut · 03-20-2014, 12:13 PM

Quote:

Originally Posted by xxscaxx

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.

xxscaxx · 03-20-2014, 12:15 PM

Quote:

Originally Posted by King Tut

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.

AZFA20 · 03-20-2014, 12:20 PM

Quote:

Originally Posted by King Tut

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.

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.

mike the snake · 03-20-2014, 04:01 PM

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.

xxscaxx · 03-20-2014, 04:12 PM

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

Reaper · 03-22-2014, 04:01 PM

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

Sent from my SAMSUNG-SGH-I747 using Tapatalk

03-19-2014, 11:56 PM	#1
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	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.

03-20-2014, 09:06 AM	#2
ecko04 Seems Legit Join Date: Mar 2013 Drives: Toyota Location: Here & There Posts: 855 Thanks: 187 Thanked 438 Times in 250 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	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. __________________ No build thread. I don't want to be reminded of how much money I spent. [insert profound quote here]

03-20-2014, 11:29 AM	#3
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	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. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

03-22-2014, 04:01 PM	#10
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	Fixxed it. Pump canister rotated when I tightened it. Oops. Sent from my SAMSUNG-SGH-I747 using Tapatalk __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Fuel pump	sw20kosh	Engine, Exhaust, Transmission	1	12-10-2013 11:21 PM
Fuel gauge misreading actual fuel in tank.	Scionshaun	Scion FR-S / Toyota 86 GT86 General Forum	19	10-09-2013 04:39 PM
FS: Visconti Fuel Pump	Sportsguy83	Engine, Exhaust, Bolt-Ons	0	03-31-2013 05:45 PM
Car fuel pump on...	Genomaxter	Engine, Exhaust, Transmission	5	11-29-2012 11:06 AM
Dynosty FR-S/BRZ Fuel System Upgrades! Deatschwerks DW65C Fuel Pump	Dustin@Dynosty	Engine, Exhaust, Bolt-Ons	3	08-21-2012 05:53 PM

03-20-2014, 12:11 PM	#4
xxscaxx Senior Member Join Date: Jul 2012 Drives: 2013 SWP BRZ Location: New York Posts: 2,240 Thanks: 458 Thanked 878 Times in 556 Posts Mentioned: 34 Post(s) Tagged: 0 Thread(s)	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.

03-20-2014, 04:01 PM	#8
mike the snake Senior Member Join Date: Jul 2013 Drives: 2013 BRZ Location: Norcal Posts: 1,592 Thanks: 1 Thanked 623 Times in 378 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	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.

03-20-2014, 04:12 PM	#9
xxscaxx Senior Member Join Date: Jul 2012 Drives: 2013 SWP BRZ Location: New York Posts: 2,240 Thanks: 458 Thanked 878 Times in 556 Posts Mentioned: 34 Post(s) Tagged: 0 Thread(s)	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

User Name		Remember Me?
Password