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  #1  
Old 09-02-2010, 02:27 PM
rangerman101 rangerman101 is offline
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Default fuel delivery

does anyone know if i can eliminate the external fuel pump on my 86 ranger by installing a bigger pump in the tank? i need some kind of solution because the wire that connects the external fuel pump to the ignition shorted and it wont run the pump when the key is on so the truck wont start. any other ideas would be greatly appreciated

thanks!!
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Old 09-03-2010, 05:18 AM
Psychopete Psychopete is offline
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Default Re: fuel delivery

89+ Rangers had a single pump intank. But you'd need to transfer lines over from that year to eliminate the secondary pump, and I am not even sure if you can use the stock fuel pump assembly. This would be a territory not may have gone through.

There is only one postitive wire driving both pumps, so I am not sure if that's the solution you want.

Is it blowing fuse links?

Think the best place to start would be to sit down with an EVTM and start diagnosing with a volt meter at the relay harnesses. Actually, the ignition is not really what drives the fuel pumps. The computer relay provides the positive side of the relay to turn it on, and the computer controls both pumps by grounding the relay. The ignition runs to the computer relay to turn it on, then the computer is what controls the pumps. So it could be that the computer is not turning on(?).

If it's just the wire that's sorted from the fuel pump relay to the fuel pumps, I know exactly where you can patch this, but you need to verify that wire is actually shorting to ground.

Last edited by Psychopete; 09-03-2010 at 05:21 AM.
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Old 09-03-2010, 05:39 PM
rangerman101 rangerman101 is offline
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Default Re: fuel delivery

it is a short in the relay wire i am positive. how do i go about patching it?
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  #4  
Old 09-04-2010, 06:51 AM
Psychopete Psychopete is offline
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Default Re: fuel delivery

Follow the pink wire from the secondary pump on the driver's side frame rail, it will go to a small single connector under the hood near the fire wall. The is where the wire runs after the inertia switch.

All you need to do is make a connection from the Orange / Light Blue wire from the fuel pump relay to the single connector and it will bypass the fuel pump main power that's running through the cab.

Be aware that this will bypass the inertia switch.
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