The signs for a bad fuel pump and filter - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 09-20-2010 Thread Starter
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The signs for a bad fuel pump and filter

What are the symptoms of a bad fuel pump and filter? thanks

1986 Mustang GT 5.0 HO
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post #2 of 6 (permalink) Old 09-20-2010
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your car won't start.
to check if you have a bad fuel pump when you turn the key to the on position and just before you start it you can hear a slight humming sound thats your fuel pump kicking in, if you can't hear it get someone to help you and if you still can't hear it, you can hit your gas tank with a rubber mallot and sometimes that'll start your car. if that starts your car you have a bad fuel pump. If not it could still possibly be a bad fuel pump.

Take 'er easy
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post #3 of 6 (permalink) Old 09-20-2010
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If your fuel filter is dirty or clogged, the engine will stumble when accelerating. Also, the fuel pump will be really loud outside the car since it's having to work twice as hard with a dirty filter.

1990 Oxford White GT(The White Elephant) Maximum Motorsports subframes & c/c plates , Mac O/R H pipe, Flowmaster "Delta Flow" mufflers, 3.73's & Mac girdle, A/C, EGR, & Smog deleted, "B" Springs, chrome Pony R's 17x8, 17x10 daily driver!
2003 SVT Cobra, Redfire Metallic
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post #4 of 6 (permalink) Old 09-20-2010 Thread Starter
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Thats exactally what it does, it stumbles like crazy. i called and asked the guy, he said he never changed it for as long as he had it, 70xxx miles on it. do you think it would make a diff? if so where is the filter located

1986 Mustang GT 5.0 HO
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post #5 of 6 (permalink) Old 09-21-2010
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It is a can shaped filter behind the gas tank. Lie down under the back of the car(may need a jack and jackstands to get the rear lifted up) On the right rear, look where the plastic gas tank cover is. Up above and behind that, the fuel filter has a line going in and out. It has a strap with one bolt holding it to the underside of the car. You will need a 5/16" fuel line disconnect tool (I got mine from advance auto, made by performance tool, red in color) and a flat screwdriver. The new filter should come with little plastic clips.
Do this job when your tank is almost empty. I usually let the car sit overnight to relieve some of the fuel line pressure. There's other ways to relieve the pressure, but I'm lazy LoL. Have a rag handy when changing the filter because you are going to get some gas running down your arm when you get the lines loose. Also, refrain from smoking while you are attempting this. Get the old clips out first. Make a mental note of how the filter is mounted. Then use the disconn. tool to get the fuel lines loose. Then remove the bolt holding the filter in its clamp. Slide the old filter out, put the new one in its place(there's an arrow showing direction of flow) Make sure when pushing the lines back on that they are ALL the way up on there, then pop the clips back on. When you are done, cycle the key on and off a few times to build up fuel pressure again.

1990 Oxford White GT(The White Elephant) Maximum Motorsports subframes & c/c plates , Mac O/R H pipe, Flowmaster "Delta Flow" mufflers, 3.73's & Mac girdle, A/C, EGR, & Smog deleted, "B" Springs, chrome Pony R's 17x8, 17x10 daily driver!
2003 SVT Cobra, Redfire Metallic
JLT RamAir Intake, Billetflow 2.93 pulley+ idlers, Mac Pro-Chamber O/R mid-pipe, Nitto 315 dr's,Billetflow brace,weight reduction, Tuned by Amazon T.S. w/ SCT software- 451rwhp/457tq
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post #6 of 6 (permalink) Old 09-21-2010 Thread Starter
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replaced the filter. made a world of difference. Took the old one and tried to blow through it, my eyes were about ready to come out from blowing so hard, i deff needed a new one. thanks guy

1986 Mustang GT 5.0 HO
Hooker Headers, MSD Ignition, BBK CAI, Bosch +4, Catless exhaust with turbo tubes(true dual), Slight Cam... and much more to come.
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