Fuel Pump installation help please
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Fuel Pump installation help please
I am replacing an aftermarket electric fuel pump with an NOS mechanical model. I don't have any instructions and the shop manual for my truck ('61 F100 with a 223 4-spd) doesn't say much more that to bolt it on and go. Now that it's installed, the truck won't fire at all. I checked another area of the book and saw a picture indicating that maybe my hoses were backward so I switched them. Still no fire. If anyone has experience with this and can tell me some things to check, I'd be greatful.
Mike
Mike
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Joined: Jan 2006
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From: North Alberta
When I thought my fuel pump was bad (240 I-6), we took off both lines to the pump, and while somebody cranked, I would feel at both holes with my fingers and feel for suction. If there is none, its possible the pump isnt working.
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How pronounced would the suction be on the pump ports? I had my wife crank the engine and I covered them with my fingers and couldn't feel much. Maybe a tiny bit of suction on one port. Is there anything internally with the engine that could be a problem as well or is the pump likely no good? The thing was NOS.
Senior User
Joined: Jan 2006
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From: North Alberta
I would say the pump is no good, but I cant remember how much suction but it should be noticable. Also, make sure its for that year, I know I tried a pump from a newer year on my truck and the pump arm (that rides on the cam) was completely different. If you do get a new pump, you can try it, and if it doesnt work, you can usually take them back, just ask first.
Also, my tank had rusted on the inside, and was plugging the outlet of the tank, which created caused it to stall after 30 seconds to a minute.
Also, my tank had rusted on the inside, and was plugging the outlet of the tank, which created caused it to stall after 30 seconds to a minute.
Postmaster
Joined: Mar 2004
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From: seattle
according to my 65 manual...which used 240 and 300 6 cylinders...the fuel pump pressure is between 4 and 6psi...V8, for a comparison is 4.5 to 6.5 psi...
Did you try blowing backwards to the tank from the fuel line at the fuel pump ??? If you do, have someone put an ear by the filler neck to listen for blowing in the tank. Also, if you look closely at the pump itself, there will be an 'IN' and 'OUT' cast into the main body. Since the 6 cylinders pump is mounted upside down, look on your original and see which side is In and which is OUT...also...if you still have your pump...hang onto it...the typical problem with these pumps is the diaphram fails. If you have a shop manual, there oughta be a pic of it blown apart in there...If not, email me and I can send you a pic of whats inside of it.
Lastly, make sure you have enough fuel in the tank...and try cranking it with the OUT line undone as it is the one that goes to the carb.
- cs65
Did you try blowing backwards to the tank from the fuel line at the fuel pump ??? If you do, have someone put an ear by the filler neck to listen for blowing in the tank. Also, if you look closely at the pump itself, there will be an 'IN' and 'OUT' cast into the main body. Since the 6 cylinders pump is mounted upside down, look on your original and see which side is In and which is OUT...also...if you still have your pump...hang onto it...the typical problem with these pumps is the diaphram fails. If you have a shop manual, there oughta be a pic of it blown apart in there...If not, email me and I can send you a pic of whats inside of it.
Lastly, make sure you have enough fuel in the tank...and try cranking it with the OUT line undone as it is the one that goes to the carb.
- cs65
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Can you tell me more about blowing back to the tank? What is this for? Unclogging something? Unfortunately I don't have an original mechanical pump for comparison to determine in and out. I'm replacing an electric aftermarket pump that finally died.
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Postmaster
Joined: Mar 2004
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From: seattle
Blowing back is to either unplug if it is or to be sure its not plugged...As for finding which side is IN and which is OUT...get a mirror and see what the pump says ...or if both lines are undone, try cranking the enginbe with each port covered and see which pulls and which pushes..
rememeber...it will take a bit to get fuel from the tank to the pump...with everything hooked up, try priming the carb a bit and firing it ...it will take a couple of times, possibly more to pick up the fuel and get it up to the carb...If the battery is kinda low...have another handy of a jump box oe similar to keep cranking speed up.
Take a pic of the pump if you can and post...
- cs65
rememeber...it will take a bit to get fuel from the tank to the pump...with everything hooked up, try priming the carb a bit and firing it ...it will take a couple of times, possibly more to pick up the fuel and get it up to the carb...If the battery is kinda low...have another handy of a jump box oe similar to keep cranking speed up.
Take a pic of the pump if you can and post...
- cs65
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I am replacing an aftermarket electric fuel pump with an NOS mechanical model. I don't have any instructions and the shop manual for my truck ('61 F100 with a 223 4-spd) doesn't say much more that to bolt it on and go. Now that it's installed, the truck won't fire at all. I checked another area of the book and saw a picture indicating that maybe my hoses were backward so I switched them. Still no fire. If anyone has experience with this and can tell me some things to check, I'd be greatful.
Mike
Mike