Question about 1990 BMW 7 Series

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My car leaking fuel only time it seems to leak is when its on a slanted surface , when ever i put gas in the car it doesnt leak out when i run the car it will start to leak... and seems to make my gas tank sensor freakout some times..i parked on a hill start started the car and my gas lught came on buh when i parked it was on half a tank..thanks

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You may have a hole on your tank that at certain car position and how the tank is filled up your gas comes out of that hole. The gas may also coming out of the fixed holes of the tank such us the outlet for the fuel lines. You may want to check on that while inspecting the tank

Posted on Jul 12, 2009

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Posted on Jan 02, 2017

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your car may not be burning off all the fuel or you are leaking. just because you dont see it on the floor doesnt mean that your not leaking. because its hot under there your evaporating faster than you drip. check your lines starting at tank. check under hood where it connects to injection system.
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It only takes a few drops of gas for you to smell it, you don't need to actually see gas leaking out.

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How to change a fuel pump


remember you are messing with gas.so no fire,sparks and smoking allowed around car.dissconnect neg. on battery.then relieve fuel pressure by taking off gas cap.take all gas out of tank.undo fuel neck,both straps,hoses and any electrical conectors.take take out from under car.remove any dirt or debri from around fuel pump.there is a locking ring that needs to turn counterclockwise.remove fuel pump and bracket assembly.discard seal.clean pump flange,surface and seal ring groove.apply a light coat of grease to seal to hold in place during install.put seal in ring groove.install fuel pump and bracket carfully to ensure filter dont get damaged.make sure the locating keys are in keyways and seal stays in groove.hold pump in place and install locking ring finger-tight.make sure locking tabs are under the tank lock ring tabs.rotate lock ring clockwise intill it stops fully.put tank back in car.make sure all connections and lines are tight.put only 10gals in tank and check for leaks.put a fuel pressure gauge on the valve on the fuel rail.turn ignition on,but dont start.turn ignition on for 3 seconds then back to off.repeat this 5-10 times or until pressure is at 35psi.if you dont get 35psi or it drops back down check for leaks.if it stays at 35psi then remove fuel pressure gauge and start car.while running check for leaks.this is directly from ford motor co.verbatom.good luck.

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