Im geting rid of the fuel injection on my truck and puting a carb on it.
So my question is what do I half to do to put a mechanical fuel pump on my motor, I can see a place to bolt one on the timing cover.
So can I just bolt one on or is there a plug or somthing I half to remove?

Thanks

 

What motor do you have? If its a 351 I may be interested in buying your fuel injection stuff off of you.

 

Forgot to mention that,
its a 302

 

If it has an intank pump and/or an inline electric you might want to see if just the intank pump will give the psi needed for the carb.

Electric in-tanks have a lot of pluses as they recharge very quickly if you run out of gas without having to crank the motor. The same applies if you have a two tank truck like I do then when one runs dry you can switch to the other without losing much power going down the road. They prime the carb the second the key is turned on instead of having to crank if the engine has been sitting.

 

You can't use the in tank pump, it has way too much pressure for a carb. Some people buy a regulator to regulate the high pressure pump down, but you have to find the right one that has a return line feature.

I am assuming you are going to take the in tank pump out? I am not sure if the mechanical pump, or a small electric pump can pull through the original electric pump. If you take the in tank pump out, you could install a external low pressure pump from the parts store. The have ones that are universal fit.

If you want to run the mechanical pump, you are going to have to take the front of the engine apart. If you want to drill and file, you might be able to get the original timing cover to work, but it's really not worth it, since you need another part from a junkyard engine anyway. What you need is the eccentric that goes on front of the camshaft to make the mechanical pump work. If you take your engine apart, you will find that your camshaft sprocket has what looks like a eccentric, but it's really just used as a washer. The piece you need has two pieces, the eccentric piece and a ring that slides around the eccentric. With this setup, the eccentric does not rub against the pump arm and wear it out.

Your simplest solution is going to be an aftermarket universal low pressure electric fuel pump.

 

the fuel injection pump will put out too much psi for a carb. you need like 5-7 psi for a carb, and your current pump is probably pumping around 35-40 psi. I converted my mustang over to a carb and bought a holley afftermarket pump for a carb. It was about a hundred bucks, but i think summit sells their own for cheaper. my mustang did not have an in tank pump, it was frame rail mounted so it was an easy swap. i am not sure how you would go about it with an in tank pump, but im sure someone else will be able to tell you how

 

This was listed at Summit and might do the trick. I would measure the intank pressure to make sure the regulator is rated for that range of input pressure.

http://store.summitracing.com/partde...5&autoview=sku

 

I learned smth about this entirely by accident; I had replaced my leaking rear tank (on an 81 F350 dual tanks mechanical pump) with one containing an electic fuel pump on the sending gauge. I wasn't sure what that electric device even *was* or what it was originally used for but I left it physically in place. Everything was fine up to around 3,000 RPM at which time the engine effectively ran out of gas.

You have been warned.

-chris

 

The in tank pump only puts out 20-35 psi at wide open according to Airtex and Carter, you could remove the railmounted boost pump and install a fuel pressure regulator available at any decent parts store to handle the job. that way youre not disturbing the sender assembly.

A Regulator much like this one

http://store.summitracing.com/partde...5&autoview=sku

 

Well I have another engine that I could get the timing cover and that eccentric. So I think that I am just going to swap them out. The less electric stuff I have the better.

 

You probably need to check/change the timing chain anyway. If you have the plastic coated gear, you can change that out to a metal one.

Also make sure not to swap the waterpumps from a serpentine style pump to a v-belt pump, or vise-versa. The serpentine pump is designed to run backwards, since it runs on the back of the belt.

 

Just for reference, my 86 EFI has the mechanical fuel pump ecentric. Although rebuilt, it's still the original engine so I'm figuring it came that way.

 

I bet it doesn't. It "looks" like it's on there, but that's only half of it. There is a ring that slips on the outer part of the piece you are looking at, and it's not on the fuel injected engines. I have heard of guys just using the part on your injected engine, but I bet after a few thousand miles, the fuel pump arm has a lot of wear on it. I didn't know this piece was missing either till I took an older engine apart that was made for a fuel pump.

 

Could be Dave....it's been about a year since I had it apart and don't recall a plastic ring. I do remember asking myself what possible value that offset ring have on that engine.

 

The ring that is missing is not plastic. It looks like a hardened metal sleeve, it's very thin. What it does is stay stationary, and is what the pump arm rides against. So instead of the pump arm rubbing the eccentric, the thin outer sleeve rubs on the eccentric. The pump arm has no rubbing action at all on it. And since the sleeve has a close tolerance fit around the eccentric, with a light film of oil inbetween, the force of the arm would be transmitted through half of the circumference of the eccentric, which would be a lot more surface area.

I think they are still using the center eccentric part on the fuel injected engines, as a washer for the camshaft gear bolt. It's probably something they still had laying around, and it does have a tang that locates it in the gear.