power to lift pump problems
#11
#12
#13
there are actually 2 feeds for the lift pump, 1st is 100% duty cycle for starting
second is 15% for normal operation
the circuit is K135 and the wires are both yellow with white stripe
they come together at splice S160 and it sounds like your 15% duty cycle is falling off
they are in 15 and 35 in pcm connector
this does not eliminate the possibility of a sick pcm
a reflash might fix the issue but I wouldnt hold my breathe
pcm is burnt with the vehicles VIN so i dont think a swap with a used one will work, but you may be able to overwrite the pcm VIN
good luck
scott
#14
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klein444
Chevy/GMC 6.2L and 6.5L
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02-21-2015 10:33 AM