300/6, Offenhauser intake, Edelbrock 400 carb. Looking for recommendations for a good electric fuel pump for this set up. The old mechanical fuel pump doesn’t seem to be doing the trick. I tried searching, but really didn’t see any good info. Let me know what you guys think.

 

Did you check your pump with a pressure tester ?
I've been having fuel delivery issues, only to discover Friday, that my 4-year old fuel hoses are PETRIFIED already.
Some hoses had spring clamps, and some have worm-drive hose clamps.
I will be buying new 3/8" fuel hoses this week and changing out all of them.

I've been running the standard Carter mechanical pump forever on my F350 Crew with NP435 trans.
I will be playing around with Accel pump squirt nozzles and squirt cams to hopefully eliminate my hesitation when accelerating from a stop light or stop sigh.

Good luck with your 300.

 

What "trick" is the pump not doing?
Pumps either work or dont work and when they dont work they can pump fuel but also leak out the vent hole and that I call not working.

The Edel carb I hear do not like anything 5 psi and up as the needle & seat cant take it and flood over.
Yes fuel lines do not last with todays fuel blends. Mine were all replaced little over 5 years ago and I had one at the carb, under psi, start leaking and no matter what I id could not get it to stop.
I had to replace that short little hose to get it to seal up.

Also going electric you then have look into the safety issues that come with it.
Electric pumps need to be mounted close to the tank(s) and should have a wet inlet, mounted below fuel level, as they do not suck / pull fuel too good.
First to wire it up right it has to have a full 12 volts so you need to wire in a relay.
You also dont want it pumping when the motor is not running like in a crash where a fuel line may break and now pumping out fuel.
So you either wire it thru a oil psi switch or off the ALT "S" lug as it will only get power when it is spinning / motor running.
This "S" lug only puts out about 6 to 9 volts so you can use it to trigger a relay.
If the carb is empty when cranking the motor with electric pump you get no fuel so not you need to add a "bypass" button to run the pump till the carb has fuel.

So is electric pump worth it when maybe replacing all rubber hoses (should be done anyway) and maybe a new motor driven pump could fix it?
Dave ----

 

I’m back to thinking I need an electric pump….ive been through about 5 mechanical pumps…..done with it. Has anyone installed one recently? Just looking for the right one for my set up.

300/6, Offenhauser intake, Edelbrock 400 carb.

 

Again why have you replaced it 5 times?
Where they all the same make from the same place as a free replacement?
Also note Edelbrock carbs dont like any fuel pressure over like 4 psi or they flood and most motor driven pumps are 5 - 7 psi, is that why you keep replacing them?

As for a pump some of the guys on the 80 - 86 truck area like the little square Facet fuel pumps and what I seen they are 2 to 4 PSI
https://www.google.com/search?q=elec...t=gws-wiz-serp
Just make sure you wire in safety that the pump stops when the motor is not running.
You can get a oil PSI switch that wil stop power going to the pump. Run power from the "I" of the solenoid so it has power when cranking and find power when the key is in run.
Dave ----

 

Yes, got various pumps from Napa, O’Reilly, and advance auto parts. All cheap made, and probably made at the same plant in Mexico. Regardless of this, I’m done with it and want to move to electric. I did read that the Edelbrock’s like lower psi and was wondering about using a fuel pressure regulator with it.

 

Thing is some electric pumps dont like to be regulated as they start to heat up.
I would not use a regulator if the pump was not made for it but that's me.

Check the link above as I seen some that have some low PSI output
Dave ----

 

IIRC when I did the 300 in my 79 F250 4x in 2014-ish, I used a Holley electric fuel pump from Napa that was to be >5psi, I mounted it on the frame rail, forward of the tank, I did have a Holley 390 cfm which from what I remember was more forgiving than the Edbrock's on incoming psi... my BIL and nieces/nephews are still driving it to this day with no issues. You can turn the key on, hear it start then stop, pump it once, fires right up. I'll have to look, but I put a new (rebuilt) engine ran FP on my 300 I put in my 66 F100 in 2020 and it still works with no issues, can't believe you've been through that many in such a short time... bad gas, heavy ethanol content, seems sum ting wong...

 

THIS WILL GET YOU STARTED -

https://www.onallcylinders.com/2023/...-electric-one/

https://www.gates.com/us/en/fluid-po...219-06039.html

https://www.gates.com/us/en/fluid-po...00-000000.html

 

Because most everything available today is from HU FLUNG DUNG AUTOMOTIVE and FORTUNE COOKIE SALES LLC.

 

He did say he got them for different places and different Manf. but yea they could all be from the same factory put in different boxes but to go through 5 in a short time I think there is something else going on to make them fail.
Dave ----

 

If one has an original mechanical fuel pump that is not crimped, it can be rebuilt with a quality ethanol resistant diaphragm. Even a crimped style can be re-done if you can find a re-builder.

If one has an early core with this design, do not trade-in or shiat-can.

What is available today is JUNK, as the pressure is not regulated correctly and doubt it is ETHANOL COMPLIANT. ETHANOL will eat a pump body as it will a carburetor. Use only ethanol rated hoses.

CARTER still offers a quality pump but output pressure is 6#.

 

Having been down this rabbit hole with several cars, I can advise as to what is best, what is second best, and everything else is not even worth considering. All this based on a mechanical pump not being an option. But, I'd have to believe that good pumps are out there. They may be more money than you are accustomed to.

The Best...
An In-Tank Walbro fuel pump with a return style regulator. The downside is cost and effort. The upside is that it will be infinitely more dependable than anything else.

Second best....
External fuel pump. A GOOD one. Also with a return style regulator. Downside is cost, but easier install. Mount the pump no higher than the bottom level of the tank.
And by all means replace ALL of the soft hoses with something that will stand up to ethanol laced fuel.

Cheap fuel pumps will leave you stranded, and the total cost of getting towed, then having to replace everything again, is much more than it would have been to do it right the first time.

My own rig has the in-tank pump. Tank is in the back. I replaced ALL the hardlines along with installing return lines with SS tube and AN fittings. The flex hose are PTFE hose with SS braided outer cover, and steel fittings. I have no worries, because I know it'll last much longer than me.