134F Head W/Electric Fuel Pump

Thinking of getting rid of my old mechanical fuel pump for a new electric one. This is the second time the new pump failed. The check valves collapse or something on the inside and I rebuilt it twice. Sick of dealing with it.
Running a 134, with a carter yf carb.

So, for people running one, what psi do you suggest, and any brand preference?

In advance, Yes, i have researched on this sight, but no finished projects that i could find, just a bunch of varied responses, so i didnt want to bump an old thread. And yes, i will put the safety valves on...

As always, thanks for looking and helping

 

Could it be crud getting stuck in the valves? Do you have a filter between the tank and pump?

Never had a mechanical fuel pump fail as you describe, in several decades. In the past, I have rebuilt one or two where the main pump diaphragm died of old age, but then they ran forever.

If this was a generic problem, why don't we hear about it more often? I'm not a fan of randomly 'improving' designs that have proven reliable for a half-century and more.

The YF wants 2.5 to 3 psi. Most electric pumps run much higher.

 

not getting rebuild kits per say, but I am having to disassemble it, and reassemble it. I cant articulate what I mean, but I pulled it all apart and reassembled it.

it may be crud, but nothing I can see. I have a filter between the gas tank and the fuel pump, and I cleaned both out. you must be lucky, as always then. as to why you don't hear about it, I cannot say. but I can say I am I'm all about improving things, if it is an improvement . if I have a faulty pump that's gone out twice on me in the last 5 years, sure I could go get a new one of the same style, but I would I trust it? most likely not. it would always be there in the back of my mind. but thank you for the PSI tidbit. that does help.

 

I prefer to use mechanical pumps when available. Very common for these old pumps to go bad from either sitting a long time or getting filled full of particles from a rusty tank. I would just buy a new pump and replace it and replace the fuel filter every other oil change. I keep a spare fuel pump on the shelf for just about every old Jeep application. Different climates may face different problems with condensation causing rust in the tanks.

 

I use the Mr. Gasket 42S Electric Fuel Pump. I have been using it for about 5 months with no problems. FLAPS had it, and would be cheap enough to keep a spare..

Runs 2-3.5 PSI on its own.. probably a sin, but I don't use a regulator with it.

 

My fuel pump is standard and I use the lever when the Jeep wasn't working during some days to fill the carb and start immediately.
Maybe you are not lucky but this is not something I would change.Whatever this is not a big amount of money so you can make a try.

 

thanks guys. I lined my gas tank when I redid all my fuel system last year. I only run ethanol free fuel too.
by putting in an electrical fuel pump, its just one less thing I would have to worry about, like the electronic distributor I upgraded to.

 

So as I understand it, you haven't tried installing new parts or a getting a new mechanical pump.
But you have concluded that the stock arrangement is "unreliable."

So my question is, what objectively leads you to believe an electrical pump would be "better?"

 

the same reasoning that leads me to believe fuel injection is better than carburation, cell phones are better than land lines, etc. if I had the time, money, and more money, I would put a 4.3 chev in it too. I like my old jeep body, but I love modern miracles of technology, as simple as they may be, and as off putting as they seem be to some people.

 

Maybe the fuel pump isnt the issue.
Here is what i did:
1. Removed inline fuel filter between tank and pump. Its clear, no restrictions at all.
2. Took the top off the pump, all gas is clear, and it all looks clean and in order.
3. New spark plugs.

The Jeep starts and idles fine. I can get it up to a certain RPM and then it starts to sputter and spit. I can get going about 40 mph, top speed, which is really really bad for me because I was going at 55 mph all day. It
Sounds like a fuel delivery issue to me. What else can i check?

 

That Mr. Gasket 42S is what I have used for the last 6 years. The mechanical pump wasn't available and the electric was. Stuck on the side of the road means you really don't have 3 to 5 days of waiting time to get another mechanical pump.

 

Easy to throw an electric pump on and see if the old mechanical pump is worn out.

 

"At a certain rpm.."

Is that the same rpm regardless of load? If it is worse going uphill, that is fuel related. The FSM has detailed instructions on how to easily test the pump for pressure and output volume. Check both.

Otherwise it could just as easily be an ignition timing/advance effect, or the point setting (for those who have them). For instance, if the advance weights were stuck it would do just what you describe.

 

He is running an electronic distributor.....mentioned in post #10.

 

Oh, right. I thought maybe but I didn't check.

So maybe that's the problem. I've had them do plenty of weird stuff, but no logical diagnosis was possible except by replacement.

 

"Somehow I love the transmission quality of a land line," said the retired telephone guy.