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  #16  
Old 05-06-2011, 09:12 AM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. What is up?

i believe you and will start looking for it. trying to have this thing running for the weekend!
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  #17  
Old 05-06-2011, 12:26 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. What is up?

does not run with the relay pulled
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  #18  
Old 05-06-2011, 01:15 PM
Doctor Wily Doctor Wily is offline
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Default Re: Fuel Pump Keeps Running. What is up?

Good. It's not suppose to. Lol. If it has been constantly running with the key on engine off (as I interpreted the complaint) then it sounds like the pump is getting a constant 12v which could be caused by a faulty relay sticking in the closed position (among other things). You might try swapping the relay with another to see if that fixes the issue. This is a fairly easy (and cheap) first step. I hate to recommend buying parts without concrete evidence but it's hard to be a 100% sure across the intertubez. You could swap it with another relay in the fusebox/pdc/smart junction box/whatever they called it in 86.
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  #19  
Old 05-06-2011, 04:00 PM
mickblock mickblock is offline
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Default Re: Fuel Pump Keeps Running. What is up?

Of course it has a relay. Just get a 30 amp relay, find it's fuse box location in your manual and swap it.

Ranger Owners Documentation

If you ask a counter guy at Autozone for a fuel pump relay, he'll try to look it up and tell you it doesn't have one if his computer screen doesn't return a search result. And it wouldn't, because it's just a relay so it doesn't have a part number and it wouldn't be in their catalog.

And I think it's the oil pressure switch that energizes the fuel pump when the engine is running.
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  #20  
Old 05-06-2011, 05:24 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. What is up?

i will give that a shot.
i took time off from re-wiring the space shuttle, solving the worlds problems, etc and got a code reader. i can't even get it to have the little triangle in the bottom of the screen with the key on position.

thanks for continued advice from people i don't even know while i am trying to get somewhere i need and want to be.
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  #21  
Old 05-06-2011, 06:07 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

unplugged the relay and it does not run at all.

put code reader on it and it does not read (no little triangle)
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  #22  
Old 05-06-2011, 06:09 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. What is up?

if that is to mean 'check fusebox' that is the first thing i did and all good to go.
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  #23  
Old 05-06-2011, 07:07 PM
Doctor Wily Doctor Wily is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

so just to clarify, when you turn the key to KOEO the pump primes and just continues to run. It does this EVERY time? or is this intermittent? The truck itself does not start? I will see if I can get a wiring diagram for the fuel pump to help us map it all out.
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  #24  
Old 05-07-2011, 01:19 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

every time. the only time it does not is with the relay pulled, TFI pulled it still does, and the code reader i got sets there with 000 and reads nothing. in KOEO
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  #25  
Old 05-07-2011, 02:02 PM
Doctor Wily Doctor Wily is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

Did you try swapping the relay yet?
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  #26  
Old 05-08-2011, 05:40 AM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

No. reason = go to get relay at parts store and its not the right one. will have to wait till monday and try dealer.
not sure how to check it if that is possible.

no mom's day this year.
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  #27  
Old 05-08-2011, 06:43 AM
FireRanger FireRanger is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

I think he means use one of the other relays in there.
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  #28  
Old 05-09-2011, 06:25 AM
Psychopete Psychopete is offline
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Default Re: Fuel Pump Keeps Running. What is up?

Quote:
Originally Posted by mickblock View Post
Of course it has a relay. Just get a 30 amp relay, find it's fuse box location in your manual and swap it.

And I think it's the oil pressure switch that energizes the fuel pump when the engine is running.
Well, he'd need to have a 89+ to have a power distribution box, 86-88 Rangers have inline fuse links. Fuses are mounted on passenger side inner fender, green plug is fuel pump, brown plug is ECC relay.

My 88 had ran for quite some time with the oil level sender disconnected (IIRC some 2.9 equipped models may never even have that). Still will run with pressure switch disconnected.

Really sounds like the relay is working (wait till you see how much Ford wants for one), but it can be tested on a bench; but if you're not sure how a relay works, start there and it will be strait forward on how to test it. The problem sounds like it's on the grounding control side of the relay from the PCM (either always grounded/short, or the computer is grounding it all of the time for whatever reason).

Try and pull codes with out the reader, if you're not getting any sanity out of the computer.......... Not saying that it's bad (how would I be able to tell based on the information found so far? , not common for them to crap out (any signs of moisture exposure?), but something to keep in mind as you're trying to figure this out).

Bad grounds can also do some strange things. A few people have had this same issue, but always been hit and miss to find it - very inconsistent. Really need to look at everything involved. Wiring diagrams are absolutely helpful on these sort of issues (the vehicle specific ones).
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  #29  
Old 05-10-2011, 08:15 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

grounded control at the diagnostic as advised and nothing happened, no pump running.
grounding = sticking copper wire in the clip and grounding other end.

signs of moisture near computer but not excessive. regular floor mat stuff.

have code reader and will pull codes after my poor decision of moving the ground over so it matched the male plug pattern on code reader. (my dad was an electrician & color blind).

i have already learned a lot from this feedback.
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  #30  
Old 05-12-2011, 03:14 PM
markford markford is offline
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Default Re: Fuel Pump Keeps Running. Welcome Any Advice!!!

Got code reader. Hooked it up and it does not read anything but the 000. i let it stay in the KOEO postion and the pump ran continously the whole time but the code reader never read any codes. it is supposed to read a seperation code of 10 and did not do that.
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