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Old 09-19-2003, 06:37 PM
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electric fuel pumps

Hi Guys Frist time using a electric fuel pump.Need to know after i turn on the pump ,it starts runs, pump fuel fine.But it keep running.Is that suppose to happen.This tank is on a street rod and does not have a return line. Thanks

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Old 09-19-2003, 07:17 PM
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Some will run all the time, some will pump up and stop until more pressure is needed. Call where you bought it and ask for the specifics.
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Old 09-19-2003, 07:21 PM
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As long as you are carburetted and bought a standard street pump your good to go. The pump runs all the time and internally senses demand and flows on demand. Pumps for fuel injected engines need a return line and race pumps have multiple outlets and require a fuel pressure regulator also. I run a Stewart warner street pump on my 1974 350 vette and an old style Bendix pump on a 1953 ford coupe with a 351 Cleveland in it, and have no problems with either. Street pumps are usually advertised as supplying 7psi or less. If you have flooding or overly rich conditions that didn't exist before, you'll need to check the pressure at the carb and if it's (somebody out there correct me if i'm wrong. please) not in the 3-6psi range you'll need to run a regulator to bring it down. I'm sorry i'ts such a long winded answer. Hope it helps.
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Old 09-20-2003, 08:41 AM
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If this is on a carbureted engine you should wire the pump through a relay, and oil pressure switch.
This works as follows:

Run power directly from your battery to the relay. Ground both the relay, and the fuel pump. Run a wire from the relay to the fuel pump. Now run your hot (ignition on) wire from your ignition source through an oil pressure switch to the relay.

When you turn your key on the pump won't turn on, pump your throttle the engine will start, now once you have oil pressure the pump will turn on. This is a safety feature for two reasons. If you loose oil pressure for any reason the pump will shut off, hopefully turning the engine off before it gets too much damage. Second if something happens such as a broken fuel line and the engine shuts off the pump will now shut off preventing a fire.
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Old 09-20-2003, 03:46 PM
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That's an excellent point tech. I do have a three post safety oil pressure switch with ignition and fuel pump hooked up to it. I think the end result is the same. If not Help?
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Old 09-21-2003, 06:44 AM
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As long as the pump only runs while the engine is runing you're good to go.
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