Question hello, I have replaced everything possible on my 3.0 1989 Chrysler new yorker from filters to pumps to main brain. and it still will start up and run for a little while and it starts to buck and shut off and on like it is not getting fuel.i ran fuel pressure test at 35 psi . I AM STUMPED. have had to other good mech. check it out and they are to. please help!
Answer Hi William,
The fuel pump pressure is supposed to be 48 psi, so that might explain the situation. It could be the fuel filter is plugged up somewhat or the pressure regulator is off-value. Re-test the pressure at the line between the fuel tank outlet and the filter and if psi 5 higher replace fuel filter. Uf still at 35 then gently squeezed the return fuel hose line and if pressure increase replace the fuel regulator. If no change then it is either the fuel pump or a clogged filter sock at the pump inside the tank.
Did you use the ignition key to get the fault codes? "On-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time? Then watch the check engine light, which remains 'on', to see it begin to flash, pause, flash, etc.
Count the number of flashes before each pause. Then repeat the process to be sure of an accurate set of flash counts. Then tell me the numbers in order of appearance.
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