Blowing the fuel pump fuse
Thread Starter
Le Mans Master
Joined: Apr 2002
Posts: 5,727
Likes: 46
From: Waukesha WI
St. Jude Donor '15
Blowing the fuel pump fuse
Hi all,
We recently had to replace the fuel pump on the 86 and decided to go with the Racetronicx pump kit (not wiring harness) with the 255lpr pump. The after a bit of back-and-forth with Racetronicx, we got a working pump but now we've blown the 10amp FP fuse twice in 30 miles.
Does anyone know if this pump is supposed to draw significantly more current that the stock pump or have any ideas where to look for problems?
Thanks!
We recently had to replace the fuel pump on the 86 and decided to go with the Racetronicx pump kit (not wiring harness) with the 255lpr pump. The after a bit of back-and-forth with Racetronicx, we got a working pump but now we've blown the 10amp FP fuse twice in 30 miles.
Does anyone know if this pump is supposed to draw significantly more current that the stock pump or have any ideas where to look for problems?
Thanks!
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
yes,
being a larger more productive motor that pushes a LOT more fuel, that increases the resistence thus making the pump draw more amperage,.yeah, it most likely needs to go up in the fuse size. I would NOT do anything until I spoke to Racetronix and verified the fuse required for that pump model. Until then I would go thru the wire harness and fuel relay to be sure there are no bad wires or shorts.
being a larger more productive motor that pushes a LOT more fuel, that increases the resistence thus making the pump draw more amperage,.yeah, it most likely needs to go up in the fuse size. I would NOT do anything until I spoke to Racetronix and verified the fuse required for that pump model. Until then I would go thru the wire harness and fuel relay to be sure there are no bad wires or shorts.
Race Director
Joined: Aug 2007
Posts: 11,889
Likes: 8
From: Whitefish Falls Ontario
St. Jude Donor '08-'09
Race Director
Joined: Sep 2003
Posts: 16,838
Likes: 341
From: Database Error Indiana
Unplug the harness at the relay and have a look. They are known to deteriorate where they plug in, sometimes short out. Mine was terrible a few years ago. I spliced in a terminal from a newer car.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
http://www.racetronix.biz/itemdesc.a...WH-013&eq=&Tp=
" The C4's factory fuel pump power circuit was designed to provide power for the light current
demands of a factory pump. . Current demands can more than double when a high-performance fuel pump is installed.... Starving a pump for voltage will cause it to slow down which escalates current demands even more thereby
compounding the problem..
Just because the factory wiring to your pump is convenient think twice about cramming a 20 amp fuse in !"
Last edited by vetteoz; Dec 23, 2012 at 07:14 PM.
