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Old 08-11-2018, 12:05 PM   #1
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Fuel pump circuit fault

I have been struggling to fix my 1997 ford f53 chassis RV. It has the 460 engine. The fuel pump quit and gave a code saying Fuel pump circuit. I dropped the tank and replaced the fuel pump (Fun). It did not fix the problem. I checked and I am only getting 7 volts to the pump. I replaced the fuse and relay with no luck. I then bypassed the relay and wired the input to the relay to the output with the fuel pump disconnected and got 12 volts there. I connected the fuel pump and it works fine with the bypass. I checked the control wires to the relay and got 12 volts at the input to the coil but did not get a ground with the key in the on position. It went from nothing to 2 volts but I expected a ground. This signal comes from the ECM. I can't seem to find this device and I am not sure if that is the cause but it seems likely at this point. At this rate I will miss the summer and never use the RV. Any help anyone could provide would help greatly.

Paul
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Old 08-11-2018, 12:32 PM   #2
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I suspect you have a corroded ground connect someplace.
How does the battery negative post look?
You can add extra ground wire from the battery to the engine, frame etc and see if that helps.
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Old 08-11-2018, 01:07 PM   #3
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Hi Paul! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with that problem.

Good luck, happy trails, and God bless!
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Old 08-12-2018, 11:07 AM   #4
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Paul, post this in the Ford Chassis forum, lots of good and knowledgeable guys there. For a quick secondary ground, use jumper cables from - battery post to a clean spot on the engine to see if that helps with 12v.
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Old 08-12-2018, 01:26 PM   #5
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Thanks for the suggestions. I believe you are correct and that the problem is probably a ground. I did try using jumper cables from the negative to the engine. No luck. I believe the engine ground itself is fine as the starter works and that needs the engine to be grounded. I think this ground issue is probably more one of the grounds that go to the ECM itself is broken or corroded. I need a wiring diagram that shows how it is wired. More importantly I need to find the thing. I will take you suggestion and repost this on the Ford Chassis forum

Thanks
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Old 08-17-2018, 03:03 AM   #6
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Old 08-17-2018, 10:40 AM   #7
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On my 1999 V10, it may be different than your 1997 V8. There is a "G" switch in case you get in an accident it shuts off the fuel pump. These have been known to pop and go bad.. I have one in my 1999. Look up under the dash just above the gas pedal.. It has a little red button on it, make sure its reset (press it)..

Here are two diagrams for my 99.. Again, I have no idea if they apply to your 97..

http://2001mirada.com/DOWNLOAD/E1I02502.pdf


http://2001mirada.com/DOWNLOAD/E1I02503.pdf


..
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Old 08-17-2018, 12:41 PM   #8
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97 does have one.

Quote:
Originally Posted by Waiter21 View Post
On my 1999 V10, it may be different than your 1997 V8. There is a "G" switch in case you get in an accident it shuts off the fuel pump. These have been known to pop and go bad.. I have one in my 1999. Look up under the dash just above the gas pedal.. It has a little red button on it, make sure its reset (press it)..

Here are two diagrams for my 99.. Again, I have no idea if they apply to your 97..

http://2001mirada.com/DOWNLOAD/E1I02502.pdf


http://2001mirada.com/DOWNLOAD/E1I02503.pdf


..
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