fuel pump or timing problem
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New User
Joined: Nov 2004
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fuel pump or timing problem
I hope you guys can help. I have a 63 F100 straight 6, probably a 223. I recently replaced the fuel pump and now she won't start. It wants to start but just will not start and stay running. It is getting plenty of fuel to the carb. but I am wondering if replacing the fuel pump has affected the timing somehow. It really acts like the timing is off. It was running fine until the fuel pump went out. Also, it was really easy to change the fuel pump and I wonder if I did it right. If it is getting plenty of fuel to the carb. the fuel pump must be installed right. Right? Any suggestions? (Carb is 1 barrell recently rebuilt).
Last edited by GBAKER; Nov 12, 2004 at 02:16 PM. Reason: carb type
Senior User
Joined: Sep 2004
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From: Lincoln, NE
Could it possibly be a flooding issue? The reason I wonder is because I don't see how changing a fuel pump chould change the timing and perhaps your new pump is delivering more fuel than the old one. Maybe as the old one started to get ineffecient the mixture screws or float settings were changed? Just a hunch.
Fleet Mechanic
Joined: Oct 2004
Posts: 1,722
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From: clinton,tn
bring up # 1 on the compression stroke , check the mark on the grank and on the rotor in the dist cap. sometimes when you shut them off if timeing chain or gears are worn they will jump after shutting off.
Junior User
Joined: Dec 2003
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From: Spring Valley Ca
Possibly the fuel pump was only part of the problem. I would definately check the timing and ensure the carb is adjusted and is not part of the problem causing a flooded situation. Just replacing the fuel pump should have no direct impact on the timing.
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Joined: Nov 2004
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Are you noticing any leaking around the carb. I have seen many a times where there is a rotten gasket or even just a loose carb and air is being sucked from the wrong place while at the same time, a little gas is leaking out from the carb.
I drove my 66 for many a miles with the carb just sitting on the intake manifold and the nuts over 1/4 inch backed off. I could actually grab the air cleaner and move the entire carb, and the truck still ran pretty well, just sputtered when I turned corners.
Just something to check before you go replacing stuff. You might put new points in also. Always try the cheap and easy fix first.
Good luck.
I drove my 66 for many a miles with the carb just sitting on the intake manifold and the nuts over 1/4 inch backed off. I could actually grab the air cleaner and move the entire carb, and the truck still ran pretty well, just sputtered when I turned corners.
Just something to check before you go replacing stuff. You might put new points in also. Always try the cheap and easy fix first.
Good luck.
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Joined: Nov 2004
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I have a 66 with the inline six and I just replaced the fuel pump as well and the carb was rebuilt now with all the new parts my truck was getting too much fuel so it ran poorly so I had to remove the front bowl (float cover) and ajust the little finger that the needle valve sits on, just take a small screw driver and slightly bend it upwards, this helped with my flooding problem and the truck runs fine now, hope this helps ya a little.
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