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With the pressure drop to zero upon pinching off the return fuel line, could the previous mechanic have accidentally reversed the lines At the fuel sender? If so, would the motor still run and explain the low pressure? Does anyone know which is the supply and which is the return connectio on...

I guess it is time to visit the overflow valve which does appear to be quite old/untouched in a long time. HOLY COW, BATMAN!!! Figure this out... when I do the classic check for the overflow valve by pinching off the return hose the pressure goes DOWN!!!!!!! The opposite of what one would...

I guess one of the previous mechanics ahd the same idea you did. The return fuel line hose has been replaced. I MADE A PRESSURE GAUGE from the information here at TDR, got the connector, installed the connector and observed the folowing: 1. pressure at idle is 14; specs in manual say 25...

Update: spent a lovely saturday with my beloved but ailing cummins... 1) checked prf-filter, not too dirty, took a pic, will try to figure out how to post it, seemed very loose upon removal, put back tight 2) solenoid seems OK, did not take off since boot was intact and passed t he tests...

Thanks ever so much... what has me most confused is that if I trigger the "missing" in the driveway, the motor will continue to run somewhat rough and the injector pump makes a clicking sound. in other words, the motor does not always cut off completely every time. does this still...

Thanks for the quik response. My poor truck has not been right for months and i miss driving it. I will check this out. Question: If the pre-filter is clogged/restricted, why do you think it would run really good till warmup?

Some info: 1994 12V 5. 9 200,000 miles, biodiesel gas for past year or more Starts great, no smoke, no problems, runs great... after a variable period of time, (motor warms up) the motor will then obviously begin to "miss" and then stall once you slow down and come off the gas pedal...