Swapping the Mechanical fuel pump with electric:

[DAVID_T]

I need to swap out my mechanical fuel pump for an electric. The mechanical is in the way of my bracket system for the power steering. I'm using the Ron Francis system, and I believe it has everything covered as far as electrical connections and a relay.

Here is the unit that attaches to my fuel tank:
https://www.autozone.com/external-engine/fuel-pump/delphi-gasoline-fuel-pump-dhp10146/342629_0?rrec=true

If you don't mind me picking your brain briefly:

I need a block off plate for the mechanical fuel pump area, and then do I need to get a regulator for this to work properly?
I notice this has a return line, but there isn't one for my carb, am I OK if I seal the return line off?

Thank you in advance!

On a secondary note, does anyone need a mechanical fuel pump? :D
147478

[Railroad]

I like the in tank pump like you posted. You will need a regulator to get the fuel pressure down to carb specs. The regulator will probably have a port for 1/8" NPT where you can run temporary or permanent, a fuel pressure gauge.
The return fuel line will run from the regulator to the gas tank.
You will need to adjust your fuel pressure with everything installed, up and running.
You can set it with just the key on to get started.
Your new fuel pump should be feed through a key on relay. 20 amp will take care of it. Your pump shows 7 amp draw.
Run some good wire. I would run 14 gauge, which might be overkill, just me.

[DAVID_T]

Thanks Railroad, the Ron Francis wiring system schematic has the fuel pump with a 15A fuse on the ignition feed. I believe that should cover all of my electrical needs.

I have an Edelbrock AVS2 650CFM, I don't see on the specs where the fuel pressure should be. Any ideas?

[egchewy79]

usually 5-8psi is what's required for carb.
the electric pump may produce 60psi, which is why the regulator is necessary.

[phileas_fogg]

I *think* I recall there are in-tank pumps designed to feed carburetors that produce far less fuel pressure than the typical EFI pumps. But since I run EFI, I didn't pay a whole lot of attention & may be completely off base.


John

[skidd]

This is the pump I installed for my Carbureted 302. It's a low pressure in tank pump

https://www.amazon.com/gp/aw/d/B008M4R69E/

It's dead headed right to the carb and makes 5-7 psi , and enough flow for my engine combo. I paid $25 new.. seems the price had gone up a bit.

[CraigS]

I may have missed it but I can't find a pressure spec for that pump. I also didn't see any mention of efi or carb which would at least give a hint of it's pressure. If you can't find the spec I'd move on. Another option would be an in the fuel line external pump. They do come specced for carbs.
7# pump=
https://www.autozone.com/fuel-systems/universal-fuel-pump/holley-12-801-1-97ghp-electric-fuel-pump/223404_0_0
4-7#=
https://www.autozone.com/fuel-systems/universal-fuel-pump/mr-gasket-4-7-psi-electric-gas-fuel-pump-12s/732035_0_0
Open your fuel line, install one of these, run power to it, and no need for a return line or a pressure regulator.

[DAVID_T]

Craig, sorry for the late reply; wouldn't running a regulator, return line, and vacuum lines make the fuel system more efficient?

[CraigS]

I don't think it would. Just makes it more complex. I know that people run systems like that but usually it is when they already have it all installed and then want to change from efi to a carb so their 40-50# system needs to be stepped down to 5-7#. My main concern w/ the pump that you linked was I could not find a pressure spec. So I wouldn't touch it. I'd use the one skidd linked though. How bad is the interference fit? Would having the inlet and outlet hose aimed differently help. If you look though Summit's listings for mech pumps you will find several that can be 'clocked'. Like this one. Remove the 6 screws, rotate, reinstall screws.
https://www.summitracing.com/parts/mrg-7706mrg/make/ford/year/1995

[Mike DiGiorgio]

as stated, Carbs need very little PSI compared to EFI. however there are a few external pumps made to run at a lower pressure that do not require a regulator, everything else will need a regulator and return line

[Chadillac]

Here is a picture of my mechanical fuel pump with power steering from Forte. Maybe a new bracket would be easier than switching out the fuel pump?

147762

By the way, you have a small cylindrical thing right next to your fuel pump. I don't have that. It's just blocked off. What is that?

[cgundermann]

If you do run an external pump, just be aware that you can hear it. The in-tank pump is masked/insulated by fuel. My EFI external pump is very loud…

Chris

[mike223]

I may have missed it but I can't find a pressure spec for that pump. I also didn't see any mention of efi or carb which would at least give a hint of it's pressure. If you can't find the spec I'd move on.

Here's the spec: 5.8 - 8.7 PSI; 58.8 - 65 GPH

Here's the link: https://ecat.spectrapremium.com/products/SP1138

[DAVID_T]

Great, the specs on my carb are 5-7. So if I grab a fixed 7 psi external pump (I have some sound deadening material, I suppose I could make a small box if I thinks it's too loud) then I'll be good as is.
Any reason why the Summit one wouldn't work? It has the same GPH and psi as the Holley linked earlier (7 psi, 97 gph) at a lower cost.
https://www.summitracing.com/parts/sum-g3136-1

I looked at other mechanical options, but March was pretty insistent that their bracket system will not work with any mechanical pump, and it's a pretty tight fit. I'll take their word on it rather than buying something from Forte that may or may not work.

I've had to redo enough things that I'm ready to be done. ;)

Chadillac, that's the oil pressure sensor/sender unit. I know a lot of guys will run one in-between the oil filter instead, as the location and engineering of this style has been much maligned by people who need to replace that little part you have blocked off. That little guy is surprisingly expensive.

[johnnybgoode]

I need to swap out my mechanical fuel pump for an electric. The mechanical is in the way of my bracket system for the power steering. I'm using the Ron Francis system, and I believe it has everything covered as far as electrical connections and a relay.

Here is the unit that attaches to my fuel tank:
https://www.autozone.com/external-engine/fuel-pump/delphi-gasoline-fuel-pump-dhp10146/342629_0?rrec=true

If you don't mind me picking your brain briefly:

I need a block off plate for the mechanical fuel pump area, and then do I need to get a regulator for this to work properly?
I notice this has a return line, but there isn't one for my carb, am I OK if I seal the return line off?

Thank you in advance!

On a secondary note, does anyone need a mechanical fuel pump? :D
147478

What kind of power steering pump are you running? This serpentine bracket from CFR clears fine with the stock Mustang pump. Scott
https://www.cfrperformance.com/FORD_MUSTANG_5_0_POWER_STEERING_BRACKET_SET_POLISH _p/hz-4306-pol.htm

[DAVID_T]

Hey Johnny, that particular bracket only works on a single pulley system, and I am set up for a dual pulley on the crank. The power steering will be it's own belt, and as a result in order for it to clear the water pump, it needs to be lower, and hits the mechanical pump. I actually have that same bracket in my garage. I need to sell it since it doesn't work for my setup.

[FLPBFoot]

Great, the specs on my carb are 5-7. So if I grab a fixed 7 psi external pump (I have some sound deadening material, I suppose I could make a small box if I thinks it's too loud) then I'll be good as is.
Any reason why the Summit one wouldn't work? It has the same GPH and psi as the Holley linked earlier (7 psi, 97 gph) at a lower cost.
https://www.summitracing.com/parts/sum-g3136-1

I looked at other mechanical options, but March was pretty insistent that their bracket system will not work with any mechanical pump, and it's a pretty tight fit. I'll take their word on it rather than buying something from Forte that may or may not work.

I've had to redo enough things that I'm ready to be done. ;)

Chadillac, that's the oil pressure sensor/sender unit. I know a lot of guys will run one in-between the oil filter instead, as the location and engineering of this style has been much maligned by people who need to replace that little part you have blocked off. That little guy is surprisingly expensive.

You're running a 302? 97 gph should be fine. Check the comments on that pump to see if there are any issues with running sound. I had a Holley Red supplied with my 427 and it was so loud I could hear it over the engine idling. Went to a more expensive HP125 and it is nice and quiet.

[DAVID_T]

It's a 351w. I didn't see any comments on the noise level of the pump. Edit: Nevermind, the comments are that this is a loud pump.

This is the one you picked up?
https://www.summitracing.com/parts/hly-12-125

[FLPBFoot]

It's a 351w. I didn't see any comments on the noise level of the pump. Edit: Nevermind, the comments are that this is a loud pump.

This is the one you picked up?
https://www.summitracing.com/parts/hly-12-125

Yes that is the one. Much more expensive but you can hardly hear a hum with the engine off. Maybe others have used something less pricey and still quiet?

[DAVID_T]

Yes that is the one. Much more expensive but you can hardly hear a hum with the engine off. Maybe others have used something less pricey and still quiet?

A quick question on this, it says 7 PSI, that's a fixed psi, and not a variable, or adjustable, correct?

[FLPBFoot]

A quick question on this, it says 7 PSI, that's a fixed psi, and not a variable, or adjustable, correct?

Yes correct. No adjustments available on the pump. BPE sent me a fuel pressure regulator with my 427 so I have that in the engine compartment that will allow adjustment. I think it's set to 6 psi to the carb.

[DAVID_T]

Perfect. I think I'll grab that one and not look back.