I dunno, I'm running a sumped sleeper tank.
jrichker - My car is gutted and I made a wiring harness. There is a +12v lead from the battery to a distribution block. From the block, I have a lead with a manual switch, then 7.5a fuse (instructions from Holley say to use that size) before going to the pump. I have blown 2 fuses so far in the hour of runtime the motor has. Any ideas what is causing this? Surge?
Also the grounds from all the accessories I have come to a distribution block before being grounded to the body.
For Hoopty:
You are blowing fuses because you are drawing too much current. Wire up the pump W/ a 6.99 30 amp 4 pin relay like this:
pin # 30 comes directly from a fused (20 a at least) direct 12v source. (like your dist block)
pin # 87 goes to the pump.
pin # 85 goes to chassis ground.
pin # 86 comes from your switch.
I looked at J rich's wire diagram, and I think it's a little over the top, but that's just how Jric Rolls,....Overkill is his middle name). I have always ran one of these relays on every high current drawing accessory I have, and currently have 7 of them running in place w/ each device. If you have wired the car yourself , better do yourself a favor and consider doing something similar. There needs to be relays for the following:
Cooling fan; water pump; fuel pump; nitrous solenoids; headlights; Pwr windows; elec vacuum pump.
I have rewired several friends circuits that were wired as you've described the one you currently have,..all because fuses have blown, nitrous solenoids have failed, wires have melted, and stuff in general isn't reliable,.... or safe.
For ID89GT:
As for the sumped tank, if this is a drag race car,....having a sump will be extra insurance that there'll never be a starvation issue w/ the tank. Acceleration forces the gas to the rear of the tank, and the sump will be in effect the lowest part of the tank.
As for the gravity feed issue, just be sure that the pump is as far back as you can get it, as low as you can get it. If you are using a early model tank that already has the proper pick up for a carb'd engine, then the tube style pick up will only be good for so much before power demand exceeds fuel supply,...( something like 350-400 HP).
For both:
Holley blue pumps are Gay. They are noisy and inconsistent, and I've seen more than a few burn up or fail because they weren't really built to run all day long. I wouldn't have one jammed up my ass if I had room for all blue pumps ever made to be there.
Even w/ the wusskin assed street motor I currently have, I wouldn't use one.
I still use a Holley pump, but I have a HP 125 on my street car.
Mounted as far back as I can get it, as low as I can get it. Drawing fuel from a custom built "sort of" sumped tank.