electric fuel pump vs. manual fuel pump - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 15 (permalink) Old 06-22-2005, 05:47 PM Thread Starter
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electric fuel pump vs. manual fuel pump

I have a 1971 302 that I am putting im my 1963 comet S-22 conv. What are the pros and cons of each and is there any HP gain/lose for either. I have a performance cam and an XCELorator 7515 manifold but no Carb at this point (any suggestions?) on the engine.

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Joe D
1963 S-22 Comet Conv.
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post #2 of 15 (permalink) Old 06-22-2005, 05:55 PM
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electric fuel pump vs. manual fuel pump

If you werent going make a lot of horsepower, I wouldn't go electrical. Mechanical pumps don't really rob much if any HP and they are a lot eaisier to install. The only reason I am running an electrical is i'm going to be making over 500 hp and needed the constant fuel flow and gph the electrical and give.
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post #3 of 15 (permalink) Old 06-22-2005, 10:14 PM
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electric fuel pump vs. manual fuel pump

There is nothing wrong with running both. I run both on my 347. A Holley mechanical and a Holley blue at the tank. On the street I run on the mechanical only. I have to run the Electric at the track or I run out of gas at the 1000'.

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post #4 of 15 (permalink) Old 06-23-2005, 06:26 PM Thread Starter
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electric fuel pump vs. manual fuel pump

Thanks for the input. I guess I will stick with the manual pump.
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post #5 of 15 (permalink) Old 06-25-2005, 09:45 AM
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electric fuel pump vs. manual fuel pump

For a daily driver i would go with a Mechanical pump

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post #6 of 15 (permalink) Old 06-25-2005, 10:30 AM
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electric fuel pump vs. manual fuel pump

The bad thing about manual pumps is you have to keep pumping them... with one hand on the wheel and the other on the pump lever you get tired out pretty quickly. And if you have a manual transmission, forget about the manual pump, unless you've got three arms. Oh wait, were we talking about MECHANICAL pumps? lol sorry couldn't help myself.

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post #7 of 15 (permalink) Old 06-25-2005, 11:47 AM
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electric fuel pump vs. manual fuel pump

Mechanical pumps are far more reliable for a driver. If you don't NEED an electrical pump, stick with the far more reliable and affordable mechanical pump.

Very few street/strip cars really NEED an electric pump.

Good Luck!
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post #8 of 15 (permalink) Old 06-27-2005, 10:57 AM Thread Starter
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electric fuel pump vs. manual fuel pump

Man, I really feel pretty stupid. You are right I wanted to say mechanical not manual. Thanks all for the info I will go with a mechanical.
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post #9 of 15 (permalink) Old 06-27-2005, 11:12 AM
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electric fuel pump vs. manual fuel pump

I've had good reliability out of stocker mechanical pumps. I've also had zero problems running Mallory electrics. I've had major problems with Edelbrock mechanical performance pumps. A mechnical pump is fine for a street car but so is a Mallory 70 electric. I like the electrics because I can switch them off. Hide the switch and it's a theft deterrent. Switch the pump off, run the car out of fuel and there's less likely to be a fuel spill and a lot less fuel to dump when you pull the carb.





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post #10 of 15 (permalink) Old 06-27-2005, 12:23 PM
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electric fuel pump vs. manual fuel pump

Carter makes a great mechanical pump. Get the standard pressure unit so you don't need to use a regulator... it's around 6psi, which is perfect. They are not that expensive, and outflow stock pumps. Dead reliable. These are the ones that look sort of like a stock unit... not the huge things Edelbrock sells.

Good Luck!
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post #11 of 15 (permalink) Old 06-29-2005, 02:00 AM
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electric fuel pump vs. manual fuel pump

I am running a carter pump, and it works great without the regulator. One downside is the noise that electrics make. I personally dont mind because I am running 40 series flomasters and a realy noisy electric fan, but for a quieter car I would not reccomend it.
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post #12 of 15 (permalink) Old 06-29-2005, 09:33 AM
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electric fuel pump vs. manual fuel pump

The Mallory pumps make very little noise. You can hear my 140GPH pump with the motor off and no back seat in the car, but it's not very loud nor is it irritating. Just a low whine. The Holley pumps tend to sound like a jackhammer laying in the trunk.



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post #13 of 15 (permalink) Old 06-30-2005, 05:17 PM
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electric fuel pump vs. manual fuel pump

My 302w LOVED its 600DP (List 4776) on the 7515 intake, very close to the stealth that later went on, also IF you fit an electric pump remember to fit an impact/iertia(SP) switch so it shuts off in a crash, that or an oil pressure switch hook up.Electric are good to fill carbs up if you have been working on them too!
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post #14 of 15 (permalink) Old 06-30-2005, 06:23 PM
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electric fuel pump vs. manual fuel pump

I used to run a Carter "big" mechanical pump on a 500+ HP turbochaged 302. Worked just fine 20 psi boost=no problem fuel wise.

Carb was too small though, but that's another story for another day!
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post #15 of 15 (permalink) Old 08-08-2019, 11:19 AM
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Re: electric fuel pump vs. manual fuel pump

Plumbing is as important as the pump itself.
Look at the inlet and outlets, most of the stock and Carter pumps only have a 1/4NPT fitting to connect the lines which they spec as a -6 or 3/8 line. If you think about that you have to ask why? The fuel will only flow at a rate of the smallest orifice which is the hole in the outlet fitting so in reality a 5/16 line is what it's really designed for.


Carbureted Performance engines obviously need more fuel volume to feed the HP output, we have sold thousands of mechanical and electric pumps over the 40 years that we did fuel systems, all our mechanical pumps went through our shop and were drilled and tapped to 3/8 NPT and adapters installed to run -06 AN lines.


Line sizing is very important to maintain proper wall pressure, using a larger line like -08 (1/2") is too large for the fuel pump to maintain constant line pressure and as the line or wall pressure drops volume drops just like your garden hose. Using too large of a line will decrease fuel volume across the needle and seat.


When we were doing fuel systems we had a cam set up on a pair of bearing and we had mounting plates made up for various mechanical pumps so we could run and test them for fuel volume and pressure at various RPM, came in very handing when chasing fuel curve issues.


Be cautious of "Free Flow" numbers we don't have a free flow fuel system on any of our carburetors they all run at 6-8 PSI, in fact Holley has even now fessed up to their false information and they now give you both I believe the Holley Blue that everyone thought made 110 GPH now shows at 6PSI a rating of 72 GPH which is smaller than a properly set up performance mechanical which we found made about 94-98 GPH (but rated at 110). Lots of things affect the flow numbers, line size, 90* cast fittings should never be used on a fuel system, fitting quality we always used nothing but Fragola USA Made fittings and you should never use one of those $5.00 guaranteed to leak chrome plated metal tube dual feed kits from China or a dual feed kit with the 90* fitting to direct the hose to the rear bowl. Use quality parts if you get a leak you may end up with a catastrophic fire... just not worth the small savings.


Make sure that your fuel filter is up to the task.
Do not use rubber fuel line! If you must use rubber line for your connections then get "Fuel Injection High Pressure Line" it designed to run pump gas. NAPA has it.



If anyone's interested I still have one SB Ford 221-302/351 ported to 3/8" in and out it's a Carter M60454 mechanical pump left over on the shelf I'd like to clear it out, $100 I'll ship it free. It has -06 adapters installed in it, sorry no box.
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