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Fuel System - How To

This story has all the math and goodies for your next fuel-pump install so you'll do it once and get it right.

By Barry Grant Fuel Systems, Photography by

If you are using a factory gas tank, the return line should be as far away from the pickup as possible to prevent the returning fuel from frothing and disturbing suction. All that fuel going to the pump has to be replaced with air in the tank, so it needs a suitably sized vent with some kind of filter attached or fuel will stop flowing.

WiringThis is easy. You'll need to run a minimum 12-gauge or preferably 10-gauge wire from a battery source to the fuel pump using a relay, and then switch the relay on and off using a 12-volt source from the ignition key or, in some cases, a toggle switch. Since fuel pumps are simply electric motors, the amount of current supplied can affect the speed, and therefore the efficiency, of the pump. Ever had a low battery or a bad connection and had your starter spin really slowly, barely turning over the engine? Same thing. The minimum voltage you should deliver to the pump is 13.2 volts, but companies like Mallory advertise the maximum pump gph rating at 14 volts, so the closer you can get to the ideal between 13.5 and 14.2 volts, the better.

Just as the power wire is important, the ground wire needs to also be 12 gauge or larger and attached to a clean portion of the frame near the pump. If the pump is straining or getting hot, check the ground circuit first.

Autogage fuel-pressure gauge ATM-2180 Summit Racing $31.95
BG 220HR fuel pump 170013 Jegs High Performance 249.99
BG King Enduro fuel pump 170044 Jegs High Performance 515.99
BG diaphragm bypass 171021 Jegs High Performance 69.99
BG fuel-cell-to-pump kit 152387 Jegs High Performance 141.99
BG pump-bypass to return-line kit 150187 Jegs High Performance 66.99
BG fuel-pump-to-regulator kit 150287 Jegs High Performance 195.99
BG regulator-to-dual-carb kit 151587-6 Jegs High Performance 183.09
BG regulator-to single-carb kit 151687-6 Jegs High Performance 94.50
Competition Engineering fuel-tank      
sump kit C4040 Summit Racing 61.88
Mighty Demon TR 650 carbs, each 5282010GC Jegs High Performance 549.99
Edelbrock mechanical fuel pump 1721 Summit Racing 85.88
Edelbrock electric fuel pump 1791 Summit Racing 145.88
Hogan's Racing Manifolds tunnel-ram N/A Hogan's Racing Call
Holley HP125 fuel pump 12-125 Summit Racing 179.95
Weiand tunnel-ram linkage kit WND-4032 Summit Racing 165.95
Summit Racing aluminum fuel cell 291220-SC Summit Racing 314.95
Aeromotive Inc.
7805 Barton St.
KS  66214
Holley Performance Products
1801 Russellville Rd.
Bowling Green, KY 42101
KY  42101
Barry Grant Fuel Systems
Jegs High Performance
COMP Cams Rick's Hot Rod Shop
El Paso
Competition Engineering
Summit Racing Equipment
P.O. Box 909
OH  44309
Hogan's Racing Manifolds
Santa Maria
By Barry Grant Fuel Systems
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