Fuel Pressure

[callen]

loosing residual fuel pressure over night in 94 530 so have to crank a while before it starts. Sooo either check valve in Pump, pressure regualator or leaking injectors......best way to determine which one.
Don't currently have a fuel pressure guage...might though buy one.

Callen 94 530i 91 535i 89 735il

[632 Regal]

you have an electric fuel pump, should pump up almost instantly. You probably have another problem like vacuum leak or need to change the plugs.

[Martin in Bellevue]

There is a retrofit in line check valve to be placed between the pump(tank) & filter. The check valve in the pump assembly wears & allows the line to bleed down overnight.

I don't have the part number handy, but Pat@BMA knows the item. It is cheap enough to try first.

[Bill R.]

There is a retrofit in line check valve to be placed between the pump(tank) & filter. The check valve in the pump assembly wears & allows the line to bleed down overnight.

I don't have the part number handy, but Pat@BMA knows the item. It is cheap enough to try first.

[callen]

Went by Dealer today to pick up valve...less than $3.00 dollars....wow. What are the plastic caps for?

Thanks

Callen

[Bill R.]

tank, I guess they don't want any sharp edges since your adding new fuel lines to that area...

Went by Dealer today to pick up valve...less than $3.00 dollars....wow. What are the plastic caps for?

Thanks

Callen

[DaCan23]

$3 stealer part? Let us know if it works, might be my fix too...

[callen]

will do....

[JonE]

Does anyone know how long of a "crank" starts to become a concern? Are we talking more than a couple seconds, ten seconds? or what? Both of my BMW's take a couple seconds or so to fire up, cold.

[Bill R.]

had it you'd know it... its more than a couple of seconds, more like between 7 and 10 seconds...

Does anyone know how long of a "crank" starts to become a concern? Are we talking more than a couple seconds, ten seconds? or what? Both of my BMW's take a couple seconds or so to fire up, cold.