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Iowa | Your fuel pressures are fine. You say "some air bubbles" in the line going to the pump. If they just look like very tiny 1/32" bubbles, that may be caused by the fuel being pulled thru 90 degree fittings. Note: diesel fuel has some air mixed in it but when fuel rushes passed a sharp 90 degree turn/fitting, then some of that air separates out of suspension, thus very tiny, tiny bubbles are normal to see. Now, you mentioned still seeing foamy liquid out of the return line(going into a bucket). I would like you to take a 3/4" open end wrench and crack/slightly loosen each steel fuel line nut where it enters the cylinder head/valve cover area(one at at time). Do this with the engine idling, look for one of those loosen line to have foamy fuel coming backwards out of it. It will be different than the others. I suspect you may have a fuel injection nozzle that isn't seating properly and it lets combustion gases/pressure shoot backwards thru the steel line and thus it aerates the entire fuel injection pump( acts just like air in the system). Before you do this test, you may have to prime the fuel injection pump with solid fuel as best you can , then start the engine, and proceed to loosen each line(one at a time), look at the fuel squirt, retighten, then proceed to the next line, while engine is idling. You will be trying to isolate the nozzle that is the culprit.
Edited by CATGUY 6/2/2009 20:51
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CAT engine stalls
