740T won't start when parked on a slope

[tim]

The latest 'charactor trait' of my '92 740T wagon...it won't start when
I've parked on a slope where the engine is higher than the tank. The
engine starts right up when I park on a level or a downward grade, and
after I move the car to either position. It's pretty obvious that I
have a fuel delivery problem. However, the car runs fine otherwise so I
don't think the fuel pump is the problem. I think I've got a leaky fuel
line and I'm drawing in air someplace (and likely squirting out feul
when the engine is running). Anyone ever experience this problem?

 

[Mr. V]

Does the problem occur when the gas tank is full?

If not, I would suspect a tear or separation in the rubber fuel
connecting line in the trunk, at the fuel pump.

It is a common problem.

 

[James Sweet]

The latest 'charactor trait' of my '92 740T wagon...it won't start when
I've parked on a slope where the engine is higher than the tank. The
engine starts right up when I park on a level or a downward grade, and
after I move the car to either position. It's pretty obvious that I
have a fuel delivery problem. However, the car runs fine otherwise so I
don't think the fuel pump is the problem. I think I've got a leaky fuel
line and I'm drawing in air someplace (and likely squirting out feul
when the engine is running). Anyone ever experience this problem?

My guess is that you have a bad pre-pump in the tank.