FP pump fuse keeps blowing, rewire done.
 

So whatever my no-start/wiring issue was, is back.

This time it blows the FP fuse on my power wire for the rewired pump when ever you try to start the car (crank).

I tried to start the car without the relay and it didn't blow the fuse, I pulled the pump to look for anything shorted or possible issues and there were none.

I plugged a diff. relay in and same result.

Now I'm not that good at these issues, but I think its either the pump itself (somehow) or stock wiring.

Any insight would be great.

Thanks
Aaron

Re: FP pump fuse keeps blowing, rewire done.
 

Try a new pump mabe? I have a evo pump if you want to try it. the stock wiring could have a short in it. Have you thought about wiring it in on a switch?

Re: FP pump fuse keeps blowing, rewire done.
 

I don't want anything on a switch to be honest, plus i want to fix what is actually wrong.

I turned the pump on in link and it works fine, didn't blow the fuse.

Could the MPI relay be bad and causing this issue?

Re: FP pump fuse keeps blowing, rewire done.
 

Ok a couple of people said that I should improve my ground to the pump.

SO I did and now when I turn on the pump via link it blows the fuse. TO me this points to the pump.
Tomorrow I will be pulling the pump and checking it out and maybe throwing a different one in to cross that off the list.

Re: FP pump fuse keeps blowing, rewire done.
 

Tried a new pump and still the same problem.

Re: FP pump fuse keeps blowing, rewire done.
 

Hows your ground on 85/86?

I'm confused as to why it blows with the relay, and doesn't without. Can you draw up a diagram of how its wired?

Re: FP pump fuse keeps blowing, rewire done.
 

My ground is good, I'm using a stock ground on the frame. Every ground I have on the car, I've used a roloc disc to get it down to bare metal.

Its wired up just like the Vfaq says, basically stock 12v wire is used to switch on the relay and power is taken straight from the battery.

Right now we are thinking it is the stock fuel sending unit, since i had a bolt running thru where the power stud used to be, we think it could be grounding thru the unit that way. So I'm looking for a new unit instead of hacking this one further.

Re: FP pump fuse keeps blowing, rewire done.
 

ah... well, yeah. That'd do it. Still doesn't really explain why it blows with relay and not without.

Re: FP pump fuse keeps blowing, rewire done.
 

Problem solved, thanks to blackawdtsi aka WOOT. and to 93GTPeater.

Basically the power wire was shorting out on the sending unit itself.

Re: FP pump fuse keeps blowing, rewire done.
 

Glad you found the problem!