when i try to start up my 87 325 the starter just spins for awhile (5-10)seconds before if fires but onlt when its warm. my dad said somthing about the fuel evaporating out or somthing :idea2 (i think not) does anyone know what this is?
I could replaced the fuel pump for $200 but I fixed the problem by putting in the fix from BMW for about $3.50,
part # "16 14 9 068 988"
Now the engine starts on first turn, hot or cold, overnight or after
standing for a while.
The check valve in the main fuel pump was leaking allowing the fuel injector rail residual pressure to bleed off resulting in formation of a huge fuel vapor bubble in the fuel rail and back down the fuel line toward the pump.
The extra cranking time was needed by the fuel pump to recompress and
eliminate the fuel vapor bubble in the line and repressurize the fuel injector rail.
Installation can be anywhere in the fuel pressure line but next to the main pressure pump is best.
So your saying that this may be the fix to my 87 325. My car fire's right up when cold. Once it's warmed up i cant tun it off or it wont start back up. Like it wont evin try to like its getting no fuel.