how do you tell if your fuel pump is going bad - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 05-26-2008 Thread Starter
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how do you tell if your fuel pump is going bad

Well that bad stutter my car is having is driving me nuts tested my car fuel pressure today(88 5.0) 35 steady at idle and max it peaks at 44 and when i unplug the regulator it stays at 44

the second that i shut my car off it goes to 0
and with just key on car off pump kicks on for a few seconds (44psi) pump will shut off and pressure goes right to 0psi
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post #2 of 10 (permalink) Old 05-26-2008
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That sounds more like the regulator to me.

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post #3 of 10 (permalink) Old 05-26-2008 Thread Starter
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so if the manual say it should be 40-55 should i get a full 55 cause the manual says low pressure is leak or pump and high pressure is pinched line or regulator
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post #4 of 10 (permalink) Old 05-27-2008
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also try changing your fuel filter
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post #5 of 10 (permalink) Old 05-27-2008
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yeah, a bad fuel pressure regulator-it's just dumping fuel back into the tank via the return line instead putting it into your engine.
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post #6 of 10 (permalink) Old 05-27-2008
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Sounds like a regulator since pressure dumps instantly.

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post #7 of 10 (permalink) Old 05-29-2008 Thread Starter
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thats prob going to be the next thing that i change but i think i found the prob 3* of timing
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post #8 of 10 (permalink) Old 05-31-2008 Thread Starter
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k

car still has the bad stutter i replaced many parts and only thing left is the fuel pump


new coil, ignition control module, plugs, wires, cap, rotor, just timed, fuel filter, pump relay, regulator, injectors, cleaned iac, k&n air filter
tested fuel pressure again now 30 idle and 40 peak with new regulator and still drops instanly to 0

suggestions pump?
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post #9 of 10 (permalink) Old 05-31-2008
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well if you are going to replace the pump no matter what, i'd go with a walbro. ive have a 255L/h from them for about 8 years and its never failed still running as strong as the day i bought it. Tho they can be a little expensive for some people, but for how long ive had mine it was worth every pennie
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post #10 of 10 (permalink) Old 05-31-2008 Thread Starter
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k
but ive done the pressure test how do you do teh volume test
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