77 ford 460 engine fuel pump question
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77 ford 460 engine fuel pump question
Hi everyone,
Bare with me here - I usually work on newer vehicles so I may not make any sense.
I am looking at purchasing a 77 ford with a 460 engine.
The owner tells me it is not getting fuel, but that when he puts fuel directly into the carb that it starts up. He goes on to tell me it just needs a fuel pump.
I have never worked with a mechanical fuel pump so I did some research. In this case the fuel pump is mounted in the top front of the engine. It looks like an easy fix. It seems like a sure bet.
My question is this. What else could be wrong that could cause no fuel?
I figure that the cam could be broken, but that doesn't really make sense. Or maybe that the fuel lines or tank could be leaky or broken somewhere before the pump?
Any ideas?
Thanks
Bare with me here - I usually work on newer vehicles so I may not make any sense.
I am looking at purchasing a 77 ford with a 460 engine.
The owner tells me it is not getting fuel, but that when he puts fuel directly into the carb that it starts up. He goes on to tell me it just needs a fuel pump.
I have never worked with a mechanical fuel pump so I did some research. In this case the fuel pump is mounted in the top front of the engine. It looks like an easy fix. It seems like a sure bet.
My question is this. What else could be wrong that could cause no fuel?
I figure that the cam could be broken, but that doesn't really make sense. Or maybe that the fuel lines or tank could be leaky or broken somewhere before the pump?
Any ideas?
Thanks
Laughing Gas
Joined: Sep 2003
Posts: 968
Likes: 5
From: Corbett, Oregon
Hello, and welcome to the site.
If the rig starts when it has fuel the problem is most likely not cam or timing gear associated.
There are several different ways to prove out a truck's fuel system (lines, hoses, etc.) and they vary somewhat depending on whether there is one or more fuel tanks and whether , with multiple tanks, they are factory or aftermarket.
The easiest way (I think) to check a fuel pump is to disconnect the inlet line from the pump, install a section of hose to the inlet and drop the other end of this hose in a can of gas that is setting on the floor. Disconnect the fuel line from the carburetor and point it into a "catch can". Now crank the engine and see how much, if any, gas gets pumped out.
A fuel pressure check is always a good test too.
Good luck.
If the rig starts when it has fuel the problem is most likely not cam or timing gear associated.
There are several different ways to prove out a truck's fuel system (lines, hoses, etc.) and they vary somewhat depending on whether there is one or more fuel tanks and whether , with multiple tanks, they are factory or aftermarket.
The easiest way (I think) to check a fuel pump is to disconnect the inlet line from the pump, install a section of hose to the inlet and drop the other end of this hose in a can of gas that is setting on the floor. Disconnect the fuel line from the carburetor and point it into a "catch can". Now crank the engine and see how much, if any, gas gets pumped out.
A fuel pressure check is always a good test too.
Good luck.
Last edited by Roger Carter; Nov 1, 2015 at 12:08 PM. Reason: Add newby greeting
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,170
Likes: 5,789
From: S/W Missouri, Polk county
Other problems, clogged in tank fuel sending unit pick up tube filter sock. Clogged in line frame mounted fuel filter, carb area fuel filter. Carb accelerator pump could be bad. If the fuel lines are broke they will mostly suck air, but will leak some fuel.
Yes the mechanical fuel pump is mounted to the dvrs side, fwd part of the engine. 2 bolts, 2 fuel lines and it comes right off.
If you have a a/c compressor bracket, it is under it and can be a PITA, but still doable. X2 on do some basic troubleshooting before dropping the fuel pump.
If it is the pump, make sure when you replace it you get the fuel pump ARM under the eccentric cam. We can walk you thru that part to, it is easy.
Yes the mechanical fuel pump is mounted to the dvrs side, fwd part of the engine. 2 bolts, 2 fuel lines and it comes right off.
If you have a a/c compressor bracket, it is under it and can be a PITA, but still doable. X2 on do some basic troubleshooting before dropping the fuel pump.
If it is the pump, make sure when you replace it you get the fuel pump ARM under the eccentric cam. We can walk you thru that part to, it is easy.
Fleet Mechanic
Joined: Nov 2009
Posts: 1,398
Likes: 6
In my case, the fuel pump was just worn. It would supply fuel at idle and even when normally accelerating. When I would get on it, the engine would bog down. After changing a bunch of other stuff, I finally changed the fuel pump and now, it runs great. Sheer genius
! If you do replace the fuel pump, you will be greatly assisted by changing your oil, since the job is much easier with the oil filter off.
! If you do replace the fuel pump, you will be greatly assisted by changing your oil, since the job is much easier with the oil filter off.
Laughing Gas
Joined: Nov 2013
Posts: 1,207
Likes: 60
From: S.E. Louisiana;so far USA
Hi everyone,
Bare with me here - I usually work on newer vehicles so I may not make any sense.
I am looking at purchasing a 77 ford with a 460 engine.
The owner tells me it is not getting fuel, but that when he puts fuel directly into the carb that it starts up. He goes on to tell me it just needs a fuel pump.
I have never worked with a mechanical fuel pump so I did some research. In this case the fuel pump is mounted in the top front of the engine. It looks like an easy fix. It seems like a sure bet.
My question is this. What else could be wrong that could cause no fuel?
I figure that the cam could be broken, but that doesn't really make sense. Or maybe that the fuel lines or tank could be leaky or broken somewhere before the pump?
Any ideas?
Thanks
Bare with me here - I usually work on newer vehicles so I may not make any sense.
I am looking at purchasing a 77 ford with a 460 engine.
The owner tells me it is not getting fuel, but that when he puts fuel directly into the carb that it starts up. He goes on to tell me it just needs a fuel pump.
I have never worked with a mechanical fuel pump so I did some research. In this case the fuel pump is mounted in the top front of the engine. It looks like an easy fix. It seems like a sure bet.
My question is this. What else could be wrong that could cause no fuel?
I figure that the cam could be broken, but that doesn't really make sense. Or maybe that the fuel lines or tank could be leaky or broken somewhere before the pump?
Any ideas?
Thanks
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