Quote:
Originally Posted by dieselbenz1
Have you considered measuring the fuel pressure on the return line. I did that in the past but never tried on the supply side. Could double to tell you when your filter is plugging off.
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There should be no appreciable pressure on the return line as that just dumps back into the tank. On the other hand if I measure the pressure on the supply side after the filter, a reduction in pressure would indicate the probability of a clogged filter, though it could also be the lift pump or the pressure relief valve. If I elect to measure both before and after the filter I can discern the pressure drop across the filter due to clogging and eliminate other factors.