quiet mod for electric fuel pump
Thread Starter
Race Director
Joined: Oct 2000
Posts: 15,055
Likes: 79
From: central FL, near the beach.
quiet mod for electric fuel pump
so my carter puts out max pressure at idle. seems dumb to me.
1. noisey
2. heats the fuel
3. will wear out faster than necessary
4. max pressure raises the float level, could contribute to a rough idle or stalling on fast turns & braking.
so i plan to add a lever switch to the carb, and a 25w 3 ohm resistor to the pump, dropping it to ~6v.
at idle and low speed it gets ~6v.
at ~40% throttle the switch gives it full 12+v.
Cost would be about ~$3, but i have the parts in my junk pile.
1. noisey
2. heats the fuel
3. will wear out faster than necessary
4. max pressure raises the float level, could contribute to a rough idle or stalling on fast turns & braking.
so i plan to add a lever switch to the carb, and a 25w 3 ohm resistor to the pump, dropping it to ~6v.
at idle and low speed it gets ~6v.
at ~40% throttle the switch gives it full 12+v.
Cost would be about ~$3, but i have the parts in my junk pile.
Last edited by Matt Gruber; Jul 30, 2007 at 06:20 AM.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I have a bellows style electric pump that will actually shut off when the pressure peaks. Basically the pump thinks when the pressure peaks that the bow; if full and the float it maxed. It shuts off until the pressure drops considerably again.
It's a great pump unfortunately it's a Summit generic and it's not made anymore.
It's a great pump unfortunately it's a Summit generic and it's not made anymore.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
I have found in history the way to deal with it is a 2-3 ohm resistor about 20 watts in series with the pump, it sees ~9 volts as I recall, but yes, the Carters will knock the seats off a Qjet needle easy...as I recall they did something like 8 psi, and a Q can only stand ~3-4 psi....
going off really old memory here, I remember using a large surge protection resistor from some old color TV years ago with my Carter pump, it kept a 550 ft lbs Pontiac 462 happy towing anything, anywhere at 80 mph up....cheeeeeep gas, nice times...
going off really old memory here, I remember using a large surge protection resistor from some old color TV years ago with my Carter pump, it kept a 550 ft lbs Pontiac 462 happy towing anything, anywhere at 80 mph up....cheeeeeep gas, nice times...
Thread Starter
Race Director
Joined: Oct 2000
Posts: 15,055
Likes: 79
From: central FL, near the beach.
