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Old 06-30-2010, 10:35 PM   #1
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Angry 1992 Ford F150 4.9L wont start..

I was driving my 1992 F150 yesterday with no problems at all. I parked outside a grocery store and went inside for about 10 minutes and came out, and she wouldn't start. The engine will crank over, but will not start.. I suspect its the fuel pump, but i would like other opinions on it. Its a 4.9L with a 5 speed.
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Old 06-30-2010, 10:58 PM   #2
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Welcome to the forum! Can you hear the pump priming?
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Old 07-01-2010, 06:47 PM   #3
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Well we sprayed carb cleaner down the brake booster vacuum line, and she cranked, and started, so i'm fairly sure its the fuel pump now. But what i'm not sure about is whether or not the pump is in the tank. If it isn't i can do it myself, but if not, i wouldn't feel safe. So if anybody know if it is or not, please tell me.
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Old 07-01-2010, 06:58 PM   #4
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theres 3 pumps. one in each tank, and one on the frame.
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Old 07-02-2010, 12:36 AM   #5
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I have a sticker under my hood from FORD ,saying " if the truck wont start try hitting the reset switch on the pump" why theres a reset switch ,and where it is I dont know ,it says to check owners manual but I dont have one
worth a try.
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Old 07-03-2010, 08:08 AM   #6
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My 1987 F150 has 3 pumps; each tank has a low pressure fuel pump
which pumps to a high pressure pump on the frame rail.

I am not sure how many fuel pumps your 1992 F150 has;
There will be one in each gas tank for sure. I was thinking that
only the 1987-89 F150 had the 3 pumps if the truck had two gas tanks.

Your 1992 F150 may have a high pressure pump in the gas tank,
just be sure you buy the correct fuel pump for your 1992 F150.


Some people raise or remove the back-bed to replace a fuel pump.

------------------------------------------------------------------------

Two years ago, I pumped the gas out of my 1987 F150 front tank.
Then I removed the two straps that hold it up to the frame,
disconnected the wires going to the fuel pump on top of the tank,
disconnected the rubber filler hose and lowered the gas tank to the ground.

Once the gas tank was out from under the truck, I used a small mallet/hammer to bump and unscrew the flange that holds the fuel pump in the gas tank.

I pulled the fuel pump/sending unit out of the gas tank carefully.

I removed the old fuel pump from the sending unit assembly and installed the new fuel pump to it. (Not that bad, just look at it real good before you disassemble it)

I used my knees or large blocks of wood to hold the tank up while
I attached the straps and hooked up the wires to the fuel pump and reconnected the filler hose.


---------------------------------------------------------------------


FYI - Approximately two months ago while driving my 87 F150,
I switched from a near empty tank to the other tank which was less than 1/2 full of gas, drove home and tried to start it after 15 minutes, it would spin and spin, but would not start. I checked all the usual stuff, nothing was wrong, but it would only start with starting fluid and then die again.
I went to the store and brought back enough gas to fill up both gas tanks.
Then I sprayed starting fluid into the throttle body air inlet and started the engine, it ran long enough for me to get around under the hood to continue spraying the starting fluid into the throttle body, after about 30-40 seconds of spraying, I stopped and my 4.9L continued to run as always.
I let it run for a while, shut it off and started it several times to be sure.

I think what happened was when I switched tanks; my high pressure pump continued to pull fuel until the Dual Function Reservoir was empty, because I had no gas in the high pressure pump or the fuel filter when I removed them, none, the entire fuel line, filter and hp pump was empty. (It had lost its prime)
Anyway, by filling both tanks with fuel, that solved my problem.

I still switch tanks at 1/4 empty, but I always have a FULL tank to switch to and
I have not had any more problems.

Hope this helps.
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Last edited by 1987 F-150 XLT 4x4; 07-03-2010 at 08:16 AM.
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Old 02-06-2011, 10:54 PM   #7
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the reset switch mentioned above i belive is located on the passenger side inside the cab behind the kickplate
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Old 02-06-2011, 11:46 PM   #8
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Quote:
Originally Posted by MetallateM View Post
I have a sticker under my hood from FORD ,saying " if the truck wont start try hitting the reset switch on the pump" why theres a reset switch ,and where it is I dont know ,it says to check owners manual but I dont have one
worth a try.
Sometimes if you are bumped or enough momentum is transferred to the truck through whatever means the fuel pump is cut off and the switch must be flicked to reset it. This is only the case though in a small collision as I know of. I guess its a precautionary measure that stops fuel from flowing, maybe to prevent a fire from starting?
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Old 02-07-2011, 01:36 PM   #9
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FIRST:: your pumps are in the tanks only.
SECOND:: if you spray started it and it kept running your pump is not bad, it is the back flow valve that is letting the fuel flow back into the tank off the motor.
BAD news if it is that you can't replace it because it is part of the pump, GOOD and i did this for about 6 months:: just cycle the key on and off about 5 or more times so the pump can push the fuel back up the line, but this puts wear on the pump and you'll have to replace it anyways mine lasted about 6 months doing this, then i would have to turn on the key and then walk to the tank and kick the bottom of the tank to get the tank to pump.
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Old 02-07-2011, 11:44 PM   #10
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Doesn't the pump run key on engine off till it is fully primed?
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Old 02-07-2011, 11:44 PM
 
 
 
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