Re: [DML] Re: Question for owners with issues.
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Re: [DML] Re: Question for owners with issues.



There have been several responses concerning the hot start problem that have 
covered the fuel system compnents that can contribute to low fuel pressure. 
One thing, regardless of fuel pressure, that hasn't been pointed out is the 
way the RPM relay ( aka fuel pump relay ) works. There may be some, new 
owners in particular, who don't realize that this relay starts the fuel pump 
during the cranking process but also shuts it off. At the same time it 
starts the fuel pump it begins looking at pulses from the ignition coil. If 
it doesn't see the pulse rate increase, which indicates the engine has 
started, with-in several seconds it shuts the pump off to prevent flooding. 
Continuous cranking will not restore fuel pressure. In this case you should 
crank for a second or two. leave the key turned to on for a few more moments 
and then turn it to off. Then repeate. Eventualy fuel pressure will be 
restored unless there is a large leak in the system. As has been pointed 
out, the mechanical injectors need a high amount of fuel pressure to open. 
The system is designed to maintin that pressure throughout a cool down 
period after which the engine is cool enough for the thermo time switch to 
trigger the electric cold start valve to open and inject fuel into the 
engine. The systems design was never intended to maintain full pressure 
indefinitely, only for an extended period of time until the engine is cold.

Bruce Benson 





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