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Old 05-03-2011, 08:08 PM   #1
Deuce Man
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Default Flathead electric fuel pump

My flathead powered 32 has fuel problems after I run it a couple hours in the florida heat. I just sent away for an electric fuel pump should I run it through the mechanical pump, or bypass the original pump and plumb it directly to the carbs? Thanks Rich.
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Old 05-03-2011, 08:34 PM   #2
Ken Bull
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Default Re: Flathead electric fuel pump

I had one on My 40 Pickup for years (remove or cut 1" off top of push rod ) ran through mechanical pump to keep engine looks-some say it acts as a pressure regulator?? Recommend hook up pump on switch seperate of ignition so you can shut off & run Carb dry for short or long storage. My 36 will get same treatment for florida heat--Also sent Coil & Water Pumps to "Skip" for same reason. The pump I use is the Airtec E8902 6v-delivers 3.5-4 psi Good luck
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Old 05-04-2011, 12:05 AM   #3
Pete
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Default Re: Flathead electric fuel pump

Good plan to put a rollover/inertia switch in the power lead to the pump.
Shuts the pump off if you get bumped real hard or roll over.
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Old 05-04-2011, 05:58 AM   #4
345 DeSoto
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Default Re: Flathead electric fuel pump

Leave your fuel pump hooked up/working, and install a 6V flow through type electric. I got mine from Sacramento Ford and have a toggle switch under the dash. Key on, switch on, and let the pump fill the carb, rather than using the starter to do it. Fires right up, then switch off. When idleing, or in the blazing sun, hit the switch...prevents vapor lock, and the pump is low enough pressure so that it won't overpower the carb float if you prefer to leave it on...or forget...
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Old 05-04-2011, 09:43 AM   #5
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Default Re: Flathead electric fuel pump

I agree, I have one on my truck. Use it to prime or help with vapor lock. Works very well with the pump. I also got gaskets for the pump from Ken.
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Old 05-04-2011, 10:02 AM   #6
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Default Re: Flathead electric fuel pump

I also use the Airtex E8902 electric pump for priming and vapor lock conditions. I use the "momentary" toggle switch...which spings back to the "off" position when you let
go.

Another thought....I noticed an article in Hemmings this month that lists a website for gas stations that sell pure gasoline instead of the ethanol added gasoline. The ethanol gasoline has a lower boiling point than pure gasoline. Would probably help to keep you away from vapor lock.

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Old 05-04-2011, 10:20 AM   #7
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Default Re: Flathead electric fuel pump

Depending on the pressure output of the electric pump it may over pressure the carb. You may need a pressure regulator to prevent that problem,
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Old 05-07-2011, 11:07 AM   #8
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Default Re: Flathead electric fuel pump

I have been running electric fuel pumps as a supplemental backup to aid in starting and/or overcome a vapor lock for over fifty years, on various makes and models of vehicles.
It is always best to locate the pump as close to the tank as possible, electric pumps push better than they pull. When purchasing an electric pump you have to make sure that the electric pump is the type that a mechanical pump can draw fuel through.
The engineer types will tell you that you need some kind of a pump kill switch, in the event that the vehicle is in an accident, however, if you are only using the electric pump to avoid a vapor lock or as a starting aid, oil pressure switches defeat the purpose of the pump because you have to crank the engine over to get oil pressure to trip the switch.
If everything in the carb is working correctly and you turn the electric pump on to prime the system on a vehicle that has been sitting for awhile, the pump will run until the fuel system is pressurized, then the electric pump will shut down. If the electric pumps keeps running the fuel system is not pressurized, a stuck float valve, etc., is usually the problem.
Some people like to plumb electric pumps so they are in a bye-pass loop around the mechanical pump. I think that the bye-pass plumbing requires a check valve to prevent the fuel from being pumped back into the tank.
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Old 05-07-2011, 05:33 PM   #9
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Default Re: Flathead electric fuel pump

If you run your electric fuel pump through the stock mechanical it is possible in case of a diaphram rupture in the mechanical to fill your crankcase with fuel.
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Old 05-07-2011, 06:05 PM   #10
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Default Re: Flathead electric fuel pump

Rich,
You said your car has "fuel problems" after a few hours of Florida heat but don't describe what they are or why you think an electric pump is required. When you have this "problem" you should take off the air cleaner and look down the throat to see if when you depress the throttle you get a squirt of out from the accelerator pump. If so, I don't think you have a fuel problem or "vapor lock" but maybe an overheated coil that will work fine after a little cooling off.
So, could you describe your fuel problem? Maybe you are wasting time and $$ on the electric pump. John
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Old 05-08-2011, 07:13 PM   #11
Deuce Man
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Default Re: Flathead electric fuel pump

John: It is definitely a fuel problem I can usually keep it runnung by pumping the gas pedal. The second stromberg is on a progressive linkage and holds anough gas to get me to a safe spot to let it simmer down not a pretty sight and downright embarrising at times. I know what you are saying,, one of m flathead buddies says" Most ignition problems turn out to be fuel, and most fuel problems usually turn out to be ignition"! Rich
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