I have an electric fuel pump ( new) that is working good. The old fuel pump is still on the block. What are the advantages, disadvantage of each type. Debating what i will use when I put it all back together Thanks

JimG

 

They're could be a flow-rate difference...don't know for sure what your Big truck needs, but suspect around3-5 Psi...the electric may be too much , Do you have a spec??
If it is too high, you may have to add an additional fuel regulator. I guess the 1st step is to find out what your original pump output is then start working from there. Is the original pump bad?? Leaking??..Jim, you are straying into the darkside....LoL!!

 

My truck already had an electric fuel pump on it when I bought it. I've seen where people here were saying that it prevented vapor lock. That might be something that you want to look into. Just my 2 cents

 

Mertz, Thanks. I doo have the specs. Approx 4-5 psi. Dont know weather the old one is working or not. Had another electric on it when I got it. I put the new electric one on when I first got the thrck because I was having fuel flow tbls. Turned out, the elctric one that was on the truck was mounted to high on the fire wall and was not pulling up fuel all that well. The old fuel pump works and I now keep it for a spare. The new electric puts out 4-7 psi and I mounted it lower, temporarily on the fram rail, so I can move it while its ripe apart.

 

Thanks new blder.

 

Hey Jim, if it were mine, I'd definately use the electric one cause: With the electric one, when you turn on the key, youve got fuel, you dont have to wait and crank the engine to get fuel to the carb. Secondly, with the correct size electric fuel pump, you dont need a regulator and it wont ever leak gas into your engine if it goes bad. I have an electric fuel pump on mine and it helped it to not be so cold natured. I just turn the key on and pump the gas a few times it starts and runs great!


Hope this helps

 

Truxx1956

Thanks, JIMG

 

I use an electric pump, mounted on the inside boxed frame rail in front of the rear axle. I didn't want to run the hose all the way to the engine (left) and then back up to the carb (cleaner look)..

you should put in an inertia switch tho for those sudden hard stops and rollovers where you KNOW you want the pump to stop even tho the power is on.

Holley and Edelbrock provide for Oil pressure based sensors.. (Holley number 12-810), there is also this generic, Fire Stop switch

How do the Oil pressure switches work when the car sits? or you crank, and the pressure comes up quickly and the pump kicks in..

Sam

 

I went with a universal electric pump from one of the major name parts stores. It has cured vapor lock issues and if it were to go bad I can get one at any parts store without having to wait for it to be ordered (or wait for the numbskull behind the counter to realize his computer doesn't go back that far). The only disadvantage to it I have, and it is trivial, is it is a little noisy. But with the Smithy's glass packs the flathead drowns out the noise once the engine starts. I do want to hook up an inertia switch on it soon, just something I've put off but it's a good safety feature to have.

 

I got a Holley red pump (7 psi no regulator) for $30 off ebay, rebuilt.

tiny bit noisy before the engine starts.. wish they had a low flow/pressure in tank unit.. one less thing hanging on the chassis

Sam

 

Watch out for the cheapos at the local parts stores, I have had two go out on me but I spent a little more for a better one and works great. Buy a spare and keep it in the truck, trust me broke down in evening rush hour traffic on I640 in Knoxville was not too fun.

 

Back when I used to run carbs we would grab the pumps off old (late 70's) honda civics and accords. They are 6psi, rubber mounted, very quiet and have a one way valve built into it so it can not back flow. They pull real well when empty so it can be a bit farther away from the tank then some others plus we never had one go out in all the years we used them. They are mounted under the rear seat area on the hondas if you were to look at the pick n pull for one.

Kevin
LFD Inc.

 

thanks for all the good fuel pump info. It helps greatly in the decission making process

JimG