Fuel Pump Issues
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Fuel Pump Issues
Alright, so we replaced the fuel pump on the ole 76 f100, its a mechanical fuel pump. We go to start it (didn't run previously, it cranks but wont turn over). Took the fuel line off at the carburetor and put the hose in a bottle to see if fuel is being delivered...nothing. Even replaced the starter thinking maybe it wasn't turning fast enough. Could the line be clogged and gummed up? It's sat for 7-8 years and I believe the previous owner ran it out of gas. I'm dumbfounded. Any ideas to why I'm not getting fuel?
Postmaster
Joined: Oct 2010
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From: Northern and Southern Cal
Yes
The lines from the tank to the pump can clog up with resin and garbage. The inlet filter inside the tank comes apart and turns into strips of crud that can be sucked into the line also.
Sorry but you're gonna have to remove and check it all.
The lines from the tank to the pump can clog up with resin and garbage. The inlet filter inside the tank comes apart and turns into strips of crud that can be sucked into the line also.
Sorry but you're gonna have to remove and check it all.
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How I start an engine that hasn't been run in years or has a possible fuel issue:First, I check the engine over to make sure it is in condition to run. Oil, all the important parts are there, etc. Then I disconnect the fuel line from the tank at the fuel pump, that way I don't suck crud into the fuel pump. Then I take my PROPANE cutting torch (DO NOT USE ACETYLENE) and drop it into the throat of the carburetor. Turn the propane on full and hit the starter. The engine should be running within a couple of seconds. If it is, then I know the ignition system is functioning, at least well enough to run. Then I start checking out the fuel system.
Starting fluid works, but it's expensive and I don't like using it if I don't have to. Pouring gas into a carburetor is a good way to start a fire. I've always got propane for my torch, it's relatively cheap, it's safe, and it's easy. JUST DON"T USE ACETYLENE!
Starting fluid works, but it's expensive and I don't like using it if I don't have to. Pouring gas into a carburetor is a good way to start a fire. I've always got propane for my torch, it's relatively cheap, it's safe, and it's easy. JUST DON"T USE ACETYLENE!
Last edited by VocaTexas; Mar 26, 2014 at 08:35 PM. Reason: correct spelling
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This happened to me not too long ago. Same exact situation. I changed the filter up by the carb thinking that would be enough but it wasn't. So then I changed the 2nd/other filter further back and I found a bunch of crud that had backed up in the line behind the filter.
Cleaned it out, changed the filter, and I was good to go.
Cleaned it out, changed the filter, and I was good to go.
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Was the second filter by the frame rail or in the fuel tank itself?And, thanks guys for the response, using the propane tank.....that sounds like a good idea! Couldn't you also use a fuel cell from perhaps a mower straight to the carb and run it like that, letting gravity be the pump?
Freshman User
Joined: Dec 2013
Posts: 40
Likes: 0
Was the second filter by the frame rail or in the fuel tank itself?And, thanks guys for the response, using the propane tank.....that sounds like a good idea! Couldn't you also use a fuel cell from perhaps a mower straight to the carb and run it like that, letting gravity be the pump?
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