Blown fuse

[Buckey]

I have a 1974 Bronco with a Holly electric Black Pro Fuel pump, Jegs 4 1/2 Psi to 9 Psi Fuel Pressure regulator. I have had no problems what so ever with this set up. I also have a 1969 Bronco with the same set up with the exception the 69 has the truck avenger carburetor. The 69 keeps blowing the fuse (7.5 as called for) they are both wired the same way. When this first started I called Jegs and they replaced the fuel pump and it worked fine for a while but has started blowing the fuse again I have now ran the ground for the fuel pump directly to the neg side of the battery but still blowing fuses. Any suggestions.

 

[bronko69er]

Try a 10A fuse.

 

[DirtDonk]

ARe you sure that the wire gauge feeding the two pumps are the same? Are they not only the same gauge, but the same (or similar) length as well?
It might just be more resistance through the circuit than the '74 has.

This is "NEW" wiring too, isn't it? Not running through any of the stock wiring in other words?

Paul

 

[Buckey]

All new wiring, all correct gauge. I think all length's are the same since they are both located in the same location but they could vary a few inches. I have noticed that neither bronco have a ground from the battery to the frame or chassis (this will be corrected on both) and I wonder if this has caused a problem with the 69 that can only be corrected by a new pump since I ran the ground to the battery and that did not fix the problem.

 

[Viperwolf1]

There may be a difference in the fuel systems which is causing the one pump to work harder than the other. 10 amps doesn't sound abnormal for current draw to a pump. If you really want to test this theory swap pumps and keep everything else the same then see what happens.

 

[Buckey]

Sounds like a good idea will try that as soon as I get the motor rebuilt in the 74 hopefully in the next 3 weeks.