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This requires a person with diesel pump experience. best have it done by an accredited diesel pump shop as if you get it wrong there will be engine damage
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Diesel truck
what is this P5002 thing, no scan too shows that for OBD2.
all have letter code, like B5002 or U5002 etc.
Pnnnn is power train codes.
is this a USA car? gen 6? FUSO
it is a top 8 ton heavy truck, and not sold here.
now called a FUSO truck 2003 to present.
all the OBD2 reader is failing, so that means DC power is failing
most the time.
signal fails means ECU stopped sending data to the tool. 4D34 is listed as direct injection turbo, correct?
step 1, stalls. and lost comms.
the battery for weak (load tested) and make sure alternator /gen is working or computers on board will go off line and dummy up.
lost comms
all fuses checked good.
Hello. It seems the fuel pump/fuel injection pump lost its 'prime' causing the engine to 'try to start' and/or 'run' until the starting fluid is gone. Yes, if the injection pump is not 'timed' right; this will, still, cause a no-start hard-start condition. Good luck and keep me informed; if you want to.
you should start by the fuel injection pump. the engine may not be getting diesel or at least diesel under pressure, this is why is starts with 'quick start'. you should also check for leaks in the fuel hose (pressure side)if there is a priming pump, check for hissing sound there it could indicate a defective priming pump introducing air in the fuel system.
There's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few like reliable-store .. let me know if u need help
thanks
If the fuel pump check valve is failing on a vehicle that old, you should likely replace the fuel pump, filter, and pressure regulator just as a matter of maintenance. Don't waste time with band-aid fixes.
Sometimes there is a plastic strainer in the gas tank and when they break down they will clog the fuel pick up. After the suction stops the pieces settle until the next time.
Ever replace the fuel filter or check for fuel getting through the filter?
Besides the inertia sensor which needs to be manually reset, some of these motors had an inline fuel pressure regulator. Another area can be a crankshaft sensor which adjusts fuel pressure to RPM.
Believe the inline pressure regulator works off vacuum so the "check engine light" would not diagnose. On the other hand, the crankshaft sensor should generate a trouble code. Curious as to what you find.
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