Electric Fuel Pump
07-16-2002, 12:19 AM
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Electric Fuel Pump
Looking for info on installing an electric fuel pump for my 300 Johnson. Best way to wire? Is it okay to dead head it? Brand (Holley seems to be the least expensive but do they work?)? Size? What do I have to disconnect from the stock system?Forgive me as I know some of these questions have been answered before, but I'm having trouble finding the threads.
Thanks for any and all help
Thanks for any and all help
07-16-2002, 02:54 AM
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Scott,
Can't help with the fuel pump question, well maybe, I think I would wire it to a separate switch on the dash, you don't want it where it could accidentally get bumped in rough water, I don't think it's good to lean those V-8s out that way.
Hope to see you on the 27th
Caleb
Can't help with the fuel pump question, well maybe, I think I would wire it to a separate switch on the dash, you don't want it where it could accidentally get bumped in rough water, I don't think it's good to lean those V-8s out that way.
Hope to see you on the 27th
Caleb
07-16-2002, 05:35 PM
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Sailor, never hooked one up to a clamp on, but 4 of us have blown big blocks and we all run the Holley pump. Most run the black pump, I run the blue one. The blue holds 7pounds of pressure with my 509 (878 hp). It is a dead head style pump with regulator. We all use oil pressure switches that shut the pump down if the motor stalls. Don't know if you can adapt one of these to your outboard. If not run a toggle switch.
Two things you might want to do. One, mount the pump as low in the boat as you can at the gas tank. Two, use a fuel pump relay to minimize voltage drop due to the long run of wire. They are available from painlesswiring.com part #50102. The relay solved the problems I was having with burning the pumps up.
Craig
Two things you might want to do. One, mount the pump as low in the boat as you can at the gas tank. Two, use a fuel pump relay to minimize voltage drop due to the long run of wire. They are available from painlesswiring.com part #50102. The relay solved the problems I was having with burning the pumps up.
Craig
07-18-2002, 01:35 PM
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On our motors we run -8 (1/2") line from the tank to the pump. -8 from pump to the y-block that splits it to the two carbs,and then -6 (3/8") from y-block to the carbs.
The ignition switch is good place to power the pump, but without the safety switch if something happened to the motor, say a fire, and stalled the motor with the key switch still on, you could end up melting a fuel line and then the pump will keep the fire going big time
A safety switch that senses oil pressure, hence a running motor, is the best way to go but technically, not necessarily a must. A big SHOULD though
Craig
The ignition switch is good place to power the pump, but without the safety switch if something happened to the motor, say a fire, and stalled the motor with the key switch still on, you could end up melting a fuel line and then the pump will keep the fire going big time
A safety switch that senses oil pressure, hence a running motor, is the best way to go but technically, not necessarily a must. A big SHOULD though Craig
