[DML] Fuel System Problems

[Samuel <samuel_yahoo@xxxxxxxxxxxxx>]

I have what is symptoms of a hot start issue, however, the following has 
been done.

Replaced the fuel pump, fuel accumulator, and o-rings in the fuel 
distributor (connector on the front/right side). With the car running, 
fuel pressure is 4.5 bar with the fuel pressure valve open. With the 
valve closed, it would cycle between 5.8 bar and 6.2 bar as the 
frequency valve cycled (reading pressure coming off the fuel 
distributor). Rest pressure is 3bar with no drop over 30 minutes.

Fuel return with just the pump running (engine off) is about 1/2 quart 
every 30 seconds (manual shows it should be 1.8 liters every 30 seconds) 
at both the fuel pump return and at the accumulator connection (fuel 
pump return line blocked off). The adjustment for the o-rings in the 
fuel distributor was not changed when the o-rings were replaced. Tried 
cooling down the warm up regulator to see if the engine would start with 
no success.

Where is the restriction likely to be and is it the cause of the hot 
start problem? After the car warms up (radiator fans running), it takes 
at minimum 2 hours to start again (and even then it barely wants to 
start running).

Samuel



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