My 89 GTA has eaten 4 fuel pumps. Dropping the tank is no small task. After blaming the pump twice, than a poor ground. I believe I an old wire bug. I will rewire my fuel pump circuit leaving it’s fail safe in tact. Has anyone done thing what their fife?

 

Look into this
https://www.racetronix.biz/product.asp?ic=fpwh-005

 

 

 

I would assume it’s the largest power supply tap other than the starter lug or battery. The alternator power is the closest to the pump.

 

The idea behind the kit is to use a larger gauge cable to reduce potential for voltage drop over the distance from front to rear. The kit mounts a relay by the axle that is switched by the stock fuel pump relay and wiring. It assumes the stock circuit functions, and it still relies on the sender harness to and into the tank.

Not too sure that the kit really does anything worthwhile besides upgrading the power wire to the pump. In stock form, the wiring takes the voltage from the battery through C100, and right to the rear bulkhead and into the tank. Not much to improve on there.

 

They use a 10 gauge wire for their kit, I duplicated it on my build.

 

But it still necks down to 16ga when it connects to the fuel tank sender harness.

It's an upgrade, sure... But the question is when does the stock wiring become a limitation?

 

It doesn't matter at all if your pump is already delivering enough fuel. In fact more voltage will just make the pump run harder and create more heat.

 

That's true, but the 16 gauge is enough for the current draw for the pump. Running a 10 gauge wire to the back, essentially negates any voltage losses over that span, running a bigger than necessary wire is more desirable than one that may be marginal.

I'd rather run some 10 gauge that I already had and have the pump draw less current, than have it pull harder than it needs especially when the weather gets hot.

 

The pump works harder at higher voltage according to the flow chart. Current goes up a little bit so the motor windings are getting hotter too.

I don't think the hot wire kit is aimed at guys with stock pumps. It is aimed at guys with bigger pumps where the stock wiring would not allow the bigger pump to operate to its potential.

 

Agreed, but if the voltage drops too far the pump is going to pull more current, I don't think it is working "harder" at higher voltage, I think it is working "optimally" since it wouldn't be pulling more current. Just like when the voltage in your house drops in the hot months with the higher demand on the grid, all the motors in the house have to pull more current to operate, current=heat, not voltage.

 

I'm just reading the pump performance curve. Current is going up at higher voltage.