Mechanical Fuel Pump

[spabula]

Hopefully some of you mechanics can chime in and give some advice...

I have a 1980 CJ-5 that's been sitting in my garage.... Which seems like forever.

It won't run... It did run..

It will run on starting fluid so I have ruled out the ignition system... And it does already have brand new: cap,rotor,plugs and wires. I assume it is fuel delivery. I drained the oil yesterday and it had a hint of gas in it. So I am going to replace the mechanical fuel pump (the reason for the gas in the oil?). Anyway, I have never had to change a mechanical fuel pump before. Is it really just as simple as disconnecting the fuel lines, unbolting and putting the new one in the old spot? Is there any "trick" to this? The lever from the pump just needs to hit the same spot on the cam as the old one, right?? Any pointers or advice would be greatly appriciated.

And yes I should've probably posted this on an automotive forum. I don't wanna join anymore forums. Lol. And besides I know we have so very competant mechanics on here!!!!!

[dc dalton]

Anyway, I have never had to change a mechanical fuel pump before. Is it really just as simple as disconnecting the fuel lines, unbolting and putting the new one in the old spot? Is there any "trick" to this? The lever from the pump just needs to hit the same spot on the cam as the old one, right??

Yup that's all it takes


Ahh the days of mechanical fuel pumps and carbs .... fuel fire and air and NO GD computer!

[xflyboy]

that about covers it.
of course there is getting those lines out of the fuel pump, be careful not to twist or break them they are steel (think old and rusty). might not hurt to replace any sections of rubber hose too, or at least check for cracks/dry rot.

[spabula]

Yes DC, the good 'ol days... Although I was only 3 when this Jeep was made.... Lol.... But I do prefer to work on older trucks with no comps... Thanks for the help guys

[Bmarshall91]

I love spark air fuel...



My 03 sucks ass to work on.

[Farbmeister]

A wee bit more than that.

Some pump work with the arm going up, other down. So you will need to figure that out.

Also fuel pressures needs to be in a certain range. Generally 3-5 psi max.

Most mechanical fuel pumps die becuase of two items: valves or diaphragm. If its a stock carb, a rebuild kit for $20 or less will fix you up. Its not hard.... a quick google should get you complete step by step instructions.

[dc dalton]

If its a stock carb, a rebuild kit for $20 or less will fix you up. Its not hard.... a quick google should get you complete step by step instructions.

Yeah OK! Would be a blast watching someone that never rebuilt a carb attempting it from Google instructions ... DAMN that's funny!

[fingers80002]

Yeah OK! Would be a blast watching someone that never rebuilt a carb attempting it from Google instructions ... DAMN that's funny!

I wanna see that!!! Maybe an easy one to start, ford VV......?

[stephpd]

It's been a while since working on a mechanical fuel pump. Not much to replacing them. Stuck fuel line fittings can be a pain. I also remember having to put a dab of grease on the rod between the pump and cam shaft to keep it up and out of the way during a few installs.

[dc dalton]

I wanna see that!!! Maybe an easy one to start, ford VV......?

Nah I'd say a Rochester quadrajet ... damn those were always a laugh a minute.