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Excessive Amperage? Holley Pump #983810 05/01/11 10:02 AM 05/01/11 10:02 AM
Joined: May 2007 Posts: 952 Queens, N. Y. FASTBACK340 OP super stock
FASTBACK340 OP super stock Joined: May 2007 Posts: 952 Queens, N. Y.	I just restored my car & when assembling I ran auxiliary wiring for my trunk release, third brake light, & electric fuel pump. All wiring is 14G with soldered and shrink wrapped connections. I've killed two 30A fuel pump relays in less than 2 years. Pump is a new Holley blue. Tank is sumped with a pre-filter before & one after the pump. Should I go 40A, or is my pump suspect? Any advice is appreciated. Thanks! `68 Barracuda 340-S

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983811 05/01/11 10:24 AM 05/01/11 10:24 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: I just restored my car & when assembling I ran auxiliary wiring for my trunk release, third brake light, & electric fuel pump. All wiring is 14G with soldered and shrink wrapped connections. I've killed two 30A fuel pump relays in less than 2 years. Pump is a new Holley blue. Tank is sumped with a pre-filter before & one after the pump. Should I go 40A, or is my pump suspect? Any advice is appreciated. Thanks! Get rid of the "pre filter", It's causing problems, I promise you. What size line do you have feeding the pump?

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983812 05/01/11 10:38 AM 05/01/11 10:38 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Should I go 40A, I believe so & seperately is 14 ga enough though that is not causing the prob w the relay live every 24 hour block of time like it's your last day on earth

Re: Excessive Amperage? Holley Pump [Re: Challenger 1] #983813 05/01/11 11:07 AM 05/01/11 11:07 AM
Joined: May 2007 Posts: 952 Queens, N. Y. FASTBACK340 OP super stock
FASTBACK340 OP super stock Joined: May 2007 Posts: 952 Queens, N. Y.	Quote: Get rid of the "pre filter", It's causing problems, I promise you. What size line do you have feeding the pump? I'm using -8 feed & supply. Interesting about the pre-filter. Quite a few people recommended it to, ironically... SAVE my pump! Looks like a simple thing to try. I thought it might be causing a restriction, but with the sump, gravity feed, and thick line....and I know the wiring is better than needed...I figured it was overkill already. Thanks for the input. `68 Barracuda 340-S

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983814 05/01/11 11:53 AM 05/01/11 11:53 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	As a diagnostic, pull the connector to the relay away just enough to get a volt meter probe on the terminals. Get everything running and check voltage on the relay pins. The relay control voltage should be 12+ volts. The pump supply voltage should also be 12+ volts. 14 guage for the relay control wires should be more than adequate. 14 guage for the power wires to the relay and pump may be a little light. The voltage test will tell. Also, not all relays are created equal. Try a Bosch. PS... the pre-filter should be very coarse - 100 micron is the standard - so it gets the big stuff out without creating too much suction.

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983815 05/01/11 09:06 PM 05/01/11 09:06 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Your trying to suck the gas uphill, not the best thing. That much line it should be #10. Pump should be down from the feed. In the wheelwell? Shouldn't be why your blowing fuse though, that's another issue, I beleive. What's the micron rating of that filter? Last edited by Challenger 1; 05/01/11 09:11 PM.

Re: Excessive Amperage? Holley Pump [Re: Challenger 1] #983816 05/01/11 11:17 PM 05/01/11 11:17 PM
Joined: May 2007 Posts: 952 Queens, N. Y. FASTBACK340 OP super stock
FASTBACK340 OP super stock Joined: May 2007 Posts: 952 Queens, N. Y.	Quote: Your trying to suck the gas uphill, not the best thing. That much line it should be #10. Pump should be down from the feed. In the wheelwell? It's actually the right side trunk extension. I have a plate protecting the pump from the tire side. I'm going to pull out the pre-filter. We'll see what happens. Thanks for everyone's input! `68 Barracuda 340-S

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983817 05/01/11 11:21 PM 05/01/11 11:21 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Thanks for everyone's input! Holler what it ends up being live every 24 hour block of time like it's your last day on earth

Re: Excessive Amperage? Holley Pump [Re: FASTBACK340] #983818 05/02/11 01:21 AM 05/02/11 01:21 AM
Joined: Dec 2008 Posts: 176 Rome, GA G GTXX member
GTXX member G Joined: Dec 2008 Posts: 176 Rome, GA	as someone else posted, 14 gauge is fine for the control wiring for a relay, but it's not big enough for running the pump. I would use at least 12 gauge, 10 ga wouldn't hurt if you're running 20+ feet of wire to hook to power.

Re: Excessive Amperage? Holley Pump [Re: GTXX] #983819 05/02/11 10:47 PM 05/02/11 10:47 PM
Joined: Sep 2006 Posts: 4,628 Columbus, Ohio wheelsup68dart master
wheelsup68dart master Joined: Sep 2006 Posts: 4,628 Columbus, Ohio	Check the pump amperage before and after you pull the pre filter. That pump should only pull 3 amps, if you are pulling high amperage then it could be either b4 or aft filter, a pressure regulator malfunctioning, or the pump windings or brushes going bad. See what combination causes the least amp draw and go from there.

Re: Excessive Amperage? Holley Pump [Re: GTXX] #983820 05/02/11 11:49 PM 05/02/11 11:49 PM
Joined: Feb 2005 Posts: 5,221 Branson, Mo. J joedust451 super gas
joedust451 super gas J Joined: Feb 2005 Posts: 5,221 Branson, Mo.	Quote: as someone else posted, 14 gauge is fine for the control wiring for a relay, but it's not big enough for running the pump. I would use at least 12 gauge, 10 ga wouldn't hurt if you're running 20+ feet of wire to hook to power. Agreed!! I always run 10 gauge for the supply on an elec. pump, 8 gauge wouldn't hurt either, 14 gauge is way too small. 75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU

Re: Excessive Amperage? Holley Pump [Re: wheelsup68dart] #983821 05/03/11 03:13 AM 05/03/11 03:13 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Check the pump amperage before and after you pull the pre filter. That pump should only pull 3 amps, if you are pulling high amperage then it could be either b4 or aft filter, a pressure regulator malfunctioning, or the pump windings or brushes going bad. See what combination causes the least amp draw and go from there. Like the man says check the pump amperage draw before you condem anything else and go from there. If it draws to much then unhook the lines and check it again with just the pump free wheeling as it should draw real low amps free wheeling. I only run 3/8 line with the Holley red pump and I use a pre filter and one at the carb and have never had any problems. 14 gauge is all I ever use for Holley pumps that draw less the 10 amps as thats more then heavy enough for a draw under 10 amps. Good luck , Ron

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