hard start, stumble

[crankin]

I have a 90 735iL that does this sometimes, maybe when warm, after its already driven. It cranks over fine, but it doesn't fire.
It is harder to start and stumbles badly when it does start. I need to goose the throttle alot to get it to rev up enough, then everything is fine. This only occurs at startup. Otherwise, the car runs great.
Any ideas on this are appreciated.

[mamilapon]

I have a 90 735iL that does this sometimes, maybe when warm, after its already driven. It cranks over fine, but it doesn't fire.
It is harder to start and stumbles badly when it does start. I need to goose the throttle alot to get it to rev up enough, then everything is fine. This only occurs at startup. Otherwise, the car runs great.
Any ideas on this are appreciated.

Sounds like the same problem ive got with my 535i. You need a check valve and hose kit fitted to the fuel supply .

[crankin]

Thanks. Did you replace yours yet? How difficult is it?