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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

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Old 04-20-2012, 04:22 PM
arich arich is offline
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86 f150 dont hear fuel pump and wont start

hello my 1986 ford f150 wont start it will turn over but no fuel getting to carb i did reset the fuel shut off switch and i dont hear the fuel pump kick in please help its a eight cylinder thanks
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Old 04-20-2012, 06:53 PM
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Which V-8?
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Old 04-20-2012, 07:58 PM
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Being a little bit of a detective, If it has a electric fuel pump, the only ones that had them were the 460's and the fuel injected 302's. Since it's a f150, it must be a 302 fuel injected engine.

You might have the the multiple fuel pump system, with a high pressure pump on the frame and the low pressure pumps in the tanks. Check for voltage at the pumps. If you have it, then the pump is bad.
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Old 04-20-2012, 10:31 PM
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Quote:
Originally Posted by arich View Post
hello my 1986 ford f150 wont start it will turn over but no fuel getting to carb i did reset the fuel shut off switch and i dont hear the fuel pump kick in please help its a eight cylinder thanks
You can force the pumps on by temporarily connecting pin 6 of the self test connector to ground.
http://img195.imageshack.us/img195/4084/obdicon.jpg
For more detail follow the link in my signature.
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Old 04-20-2012, 11:05 PM
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I would check fuses and the fuel pump relay first, on the 86 302 EFI i had the relay was on the left fender about in line with the brake booster. I don't have testing procedures, but they are not that expensive and I always kept a spare in the glove box.
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Old 04-21-2012, 05:53 PM
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fuel issue

it is the 302 efi i cant get any voltage at the pump on the frame rail
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Old 04-21-2012, 08:40 PM
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it is the 302 efi i cant get any voltage at the pump on the frame rail
Did you ground the pin 6 in the test connector? If not the pumps will only run (prime) for a couple of seconds then the EEC shuts power to the pumps off via the relay.
Grounding the test pin will force the relay / pumps on so you can take a voltage reading. Or you can have a helper switch the ignition key on and off repeatedly.
If pumps will not come on and there is no voltage at pump then likely the relay is bad.
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Old 04-21-2012, 08:51 PM
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hello i tried to ground out the fuel pump as per picture but just got clicking at relay please help
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Old 04-21-2012, 10:02 PM
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Get your meter or testlight out, and when the relay clicks, see if you have power at the inertia switch that you reset. See if you have power going in and coming out. If it's not going in, you know the problem is upstream. If you have power coming out, then you know the problem is downstream of the switch. Of course you know where the problem is if you have power going into the switch and nothing coming out.
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Old 04-21-2012, 11:20 PM
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inertia switch

hello in my manual the reset switch is under center of dash but in the manual i bought says under drivers dash left of brake pedal or on right kick plate, i found the one under center of dash with white reset switch. is there two another with red reset switch THANKS
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Old 04-21-2012, 11:33 PM
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hello in my manual the reset switch is under center of dash but in the manual i bought says under drivers dash left of brake pedal or on right kick plate, i found the one under center of dash with white reset switch. is there two another with red reset switch THANKS
There is only one inertia switch located on passenger side near the heater duct. Has white button on top.

I think your manual is referring to later model years where it was moved over to the drivers side.
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http://home.budget.net/~klricks/F150/Ford86F150.html
(OBD1 code reading and fuel system info)
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Old 04-22-2012, 09:22 PM
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MULTI METER READING AT EXTERIOR FUEL PUMP

HELLO MY READING WAS 1.4 MA LOWEST SETTING ON DC MULTI METER IT READ FOR COUPLE SECONDS DOES THAT MEAN FUEL PUMP SHOULD I TAKE OUT AND BENCH TEST THANKS
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Old 04-22-2012, 09:54 PM
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I honestly don't know what a "normal" ohm reading (not amp reading) would be through an electric motor, but 0 ohms = open circuit = burned-out motor.

Since you get something on your meter, I'd try applying 12V directly to the motor's leads and see what happens.
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Old 04-23-2012, 07:38 AM
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HELLO MY READING WAS 1.4 MA LOWEST SETTING ON DC MULTI METER IT READ FOR COUPLE SECONDS DOES THAT MEAN FUEL PUMP SHOULD I TAKE OUT AND BENCH TEST THANKS
An amp reading that low is almost nothing for a motor. I am curious as to how you hooked up the meter? Taking a current (Amps) reading is the most difficult reading to take so most people don't do it. Requires you to break the circuit somewhere in line and insert the meter leads. Also the motor can be jammed or stuck or broken, and still have current going through it.

I would stick with the voltage reading and see if you get 12 Volts at the pump connector.
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http://home.budget.net/~klricks/F150/Ford86F150.html
(OBD1 code reading and fuel system info)
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Old 04-23-2012, 07:43 AM
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Quote:
Originally Posted by ctubutis View Post
I honestly don't know what a "normal" ohm reading (not amp reading) would be through an electric motor, but 0 ohms = open circuit = burned-out motor.

Since you get something on your meter, I'd try applying 12V directly to the motor's leads and see what happens.
I know this is probably what you meant... 0 Ohms would be a dead short. An open circuit gives infinite resistance which is displayed as a '1' on most meters.
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(OBD1 code reading and fuel system info)
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Old 04-23-2012, 07:43 AM
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