External fuel pump check valve?

[Scott314]

I've heard that there an external check valve that BMW released for the E32 750i, and that it can be retrofitted to an e30 if the internal check valve goes bad. I looked at BMA and Pelican, and I couldn't find any part like that. Has anyone ever heard of this fix?

[digger]

I've heard that there an external check valve that BMW released for the E32 750i, and that it can be retrofitted to an e30 if the internal check valve goes bad. I looked at BMA and Pelican, and I couldn't find any part like that. Has anyone ever heard of this fix?

firstly how do you know the check valve is faulty?

[Scott314]

firstly how do you know the check valve is faulty?

The engine cranks for a long time before it fires. The fuel pressure is fine, the injectors don't leak, and the fuel pressure drops right away when the engine is shut off.

[MarkH]

The part number is 16-14-9-068-988, and it is about $8-9 at the dealer. I had the exact same problem you did and installed this a week or so ago. The car now fires quickly and I have not had to crank the engine 10+ times once. This includes the valve, a length of hose, and a protective cover. I installed it at the output of the fuel pump, right at the tank.

[digger]

and the fuel pressure drops right away when the engine is shut off.

what does it drop to and how long does it take?

[Scott314]

what does it drop to and how long does it take?

It drops to 0 in probably 5 seconds.

[Scott314]

The part number is 16-14-9-068-988, and it is about $8-9 at the dealer. I had the exact same problem you did and installed this a week or so ago. The car now fires quickly and I have not had to crank the engine 10+ times once. This includes the valve, a length of hose, and a protective cover. I installed it at the output of the fuel pump, right at the tank.

Cool, this is what I was looking for. I think I read about it on an e34 site, but instead of giving the BMW part number, they just had a link to BMA Parts or something, and BMA doesn't list it on their site anymore.