460 not getting fuel
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Joined: Jul 2004
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From: Thorold, Ontario, Canada
460 not getting fuel
OK this truck is a 1977 F250 4x4 with a 460 in it. It always starts up on a dime, never a problem. It recently ran out of gas and has sat for a few weeks. I put about 1/4 tank of gas in it and tried to start it and got nothing! We checked the fuel filter, it was dirty but no fuel was even getting there. We checked the in cab tank sending unit, it gets power. Not sure if it works but it gets power so that rules out electrical issues. How often do the mechanical pumps go on these engines? I have not had the truck long and its not even ont he road yet, I finally got some temp plates to go get it saftied and now it all of a sudden doesn't start.
Any ideas?
From what I can see no fuel is getting past the mechanical pump but how can I check to see if its even getting to the pump? Will the electrical sending unit pump it to the mechanical pump and the mechanical pump push it from there to the carb? I am new to carbed motors and mechanical pumps so I am not sure exactly how they work. I can pour fuel into the carb and it tried to start then, so I know I got spark. Last time I started it, it was hard to start due to being almost out of gas.
Any ideas?
From what I can see no fuel is getting past the mechanical pump but how can I check to see if its even getting to the pump? Will the electrical sending unit pump it to the mechanical pump and the mechanical pump push it from there to the carb? I am new to carbed motors and mechanical pumps so I am not sure exactly how they work. I can pour fuel into the carb and it tried to start then, so I know I got spark. Last time I started it, it was hard to start due to being almost out of gas.
Last edited by 460_Sprout; Sep 12, 2004 at 09:00 PM.
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The pump diaphram may have let go. Also, you might prime the pump by pouring a small amount of fuel down to it through the carb feedline. The seals in the pump may be so dry from age that it can't lift the fuel out of the tank.
Brad
Brad
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Senior User
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From: Thorold, Ontario, Canada
ahh ok, I'll give those a try guys, like I said before the truck starts like a dream until the other day, I'll try priming the pump with a clean filter and see what happens.
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