Car smells like gas - leak on fuel sending unit under seat (PICS)

sonic1 · 08-29-2017, 01:14 AM

Car started to smell like gas around the rear drive wheel well several days ago. Turns out there is a fuel leak around the fuel sending unit. Looks like the solution is either to replace the fuel sending unit or replace the o-rings. Searched and didn't find a very clear DIY on how to replace the fuel sending unit.

Any idea how long it takes to replace the fuel sending unit? I was told it needs to be replaced and will cost around $100 in labor (or 1 hr or so).

Thanks!

View post on imgur.com

CoffeeBean · 08-29-2017, 04:51 PM

See the videos at the bottom of this page: http://www.fuel-it.biz/e-series-135i...2-lpfp-upgrade

You don't need the "special tool" for the lock ring, just use a hammer and flathead.

Riceball777 · 08-30-2017, 03:36 AM

Same thing happen to me about a year ago. That unit under the driver side rear seat is called the fuel pressure regulator. Mine had a tine crack on the top and would leak out gas. I just bought a new one on ecs and no more leaks. It's pretty easy to install. And a new one is not too expensive only $175. Here is where I bought mine.
https://www.ecstuning.com/b-genuine-...t/16117163295/

N54Society · 01-15-2019, 06:08 PM

Ugh...I think I need to get one of these kits. I smell fuel in the garage.

lowrydr310 · 01-16-2019, 12:55 PM

I stop by my local pick-a-part junkyard about once a month to see what odd parts I can find for any of my cars. They always have at least 3-4 E90s present and the last few times I've gone there I noticed that every one of them had the fuel pumps (passenger side?) and regulator (drivers side) removed.

I guess this is a relatively common failure. Considering that, I know I'd prefer to install a new one rather than a junkyard part.

I only smell fuel in my garage after topping off my tank, letting the auto-shutoff on the pump activate. I will smell fuel around the passenger side rear wheel well, same side as the fuel door. The last few times I've fueled, I approximated the volume of fuel needed to fill and stopped just before it was full, and didn't smell anything.

Bmansbmw · 01-19-2019, 07:26 PM

Loss of power limp mode

Just had exact issue. After replacing mine I now don't have relief pressure when fueling. Before it always had the relief when unsrewing fuel cap. It throws it in limp mode when I press gas hard.

( side note. I had to replace starter at the same time. Or could los of power be from a missed vacuum hose )

08-29-2017, 01:14 AM	#1
sonic1 Private First Class 94 Rep 133 Posts Drives: BMW Join Date: Dec 2011 Location: USA iTrader: (3)	Car smells like gas - leak on fuel sending unit under seat (PICS) Car started to smell like gas around the rear drive wheel well several days ago. Turns out there is a fuel leak around the fuel sending unit. Looks like the solution is either to replace the fuel sending unit or replace the o-rings. Searched and didn't find a very clear DIY on how to replace the fuel sending unit. Any idea how long it takes to replace the fuel sending unit? I was told it needs to be replaced and will cost around $100 in labor (or 1 hr or so). Thanks! View post on imgur.com
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08-29-2017, 04:51 PM	#2
CoffeeBean Lieutenant 226 Rep 553 Posts Drives: 640i M-Sport GC Join Date: Aug 2012 Location: AL iTrader: (2)	See the videos at the bottom of this page: http://www.fuel-it.biz/e-series-135i...2-lpfp-upgrade You don't need the "special tool" for the lock ring, just use a hammer and flathead.
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08-30-2017, 03:36 AM	#3
Riceball777 Lieutenant 163 Rep 466 Posts Drives: S2000 618whp/ e90 335i Join Date: Jul 2012 Location: Los Angeles iTrader: (0)	Same thing happen to me about a year ago. That unit under the driver side rear seat is called the fuel pressure regulator. Mine had a tine crack on the top and would leak out gas. I just bought a new one on ecs and no more leaks. It's pretty easy to install. And a new one is not too expensive only $175. Here is where I bought mine. https://www.ecstuning.com/b-genuine-...t/16117163295/ __________________ 2007 e90 335i pure stage 2 DD turbos, rb inlets
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01-15-2019, 06:08 PM	#4
N54Society Major Private First Class 449 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Ugh...I think I need to get one of these kits. I smell fuel in the garage. __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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01-16-2019, 12:55 PM	#5
lowrydr310 Robot 1685 Rep 2,190 Posts Drives: 2006 330i, 2007 E93 335i Join Date: Apr 2013 Location: Souhtrne Califniora iTrader: (0)	I stop by my local pick-a-part junkyard about once a month to see what odd parts I can find for any of my cars. They always have at least 3-4 E90s present and the last few times I've gone there I noticed that every one of them had the fuel pumps (passenger side?) and regulator (drivers side) removed. I guess this is a relatively common failure. Considering that, I know I'd prefer to install a new one rather than a junkyard part. I only smell fuel in my garage after topping off my tank, letting the auto-shutoff on the pump activate. I will smell fuel around the passenger side rear wheel well, same side as the fuel door. The last few times I've fueled, I approximated the volume of fuel needed to fill and stopped just before it was full, and didn't smell anything.
	Appreciate 0 Quote

01-19-2019, 07:26 PM	#6
Bmansbmw Registered 0 Rep 1 Posts Drives: 2007 335i Join Date: Jan 2019 Location: Texas iTrader: (0)	Loss of power limp mode Just had exact issue. After replacing mine I now don't have relief pressure when fueling. Before it always had the relief when unsrewing fuel cap. It throws it in limp mode when I press gas hard. ( side note. I had to replace starter at the same time. Or could los of power be from a missed vacuum hose )
	Appreciate 0 Quote