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hot start problem 200

uid 18886's pic
posted by  sdewolfe on  Tue Apr 29 21:07 CST 2008
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last visit: Mon Jan 31 05:56 CST 2011
[RELATED]

HUMBO,

Sure enough, we put a pressure gage on the fuel distributor and it is losing pressure.

What is the pressure while the pumps are running? It should be above 65psi. How far does it drop when the pumps are turned off? The spec given in the Green Book is no less than 24psi after 20 minutes at rest. Does the pressure drop lower than that?

The reason I ask is that the fuel distributor, as you pointed out, is expensive and difficult to get to. It is best to eliminate all possibilities before replacing that component.

Have you checked to see if there is fuel flow from the return line port after the pumps have stopped? Fuel flow from the return port should stop when the pressure falls below 65psi. If it does, the pressure is dropping because of outflow or backflow, not return, which, unless I misunderstand the fuel distributor, is the only place that fuel can leave the distributor and the fuel distributor be at fault. An outflow problem will be either the injectors or the frequency valve. Backflow will be a an external leak, accumulator, or check valve.

--
Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 52 year old fat man.






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