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Fuel pressure bleed down 700 1990

posted by  someone claiming to be Guy Prichard on  Mon Nov 17 07:14 CST 2003 [RELATED]

My 1990 740GL (330,000 miles) with B230F engine is hard to start. By that I mean that the engine cranks for 4-5 seconds before it starts. In contrast my 2003 S60 fires in an instant. I put a fuel pressure guage on the injector rail and it hangs in at a steady 40 PSI at idle. When the engine is turned off the 40 PSI bleeds down to nothing in less than one minute. When I go to re-start, the engine doesn't start until the fuel pressure builds back up to 40 PSI. By pinching various fuel hoses I have determined that the pressure is bleeding off through the in tank pump. My understanding is that the pump in the tank has a "check valve" that is supposed to prevent this from happening. Is this true or is there a check valve somewhere else in the system that I don't know about that has failed.

Thanks for the help.

Guy P.





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New Fuel pressure bleed down [700][1990]
posted by  someone claiming to be Guy Prichard  on Mon Nov 17 07:14 CST 2003 >


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