Thank you, Wm L, for sharing your years of experience with electric fuel pumps. I’ve completed the project using your helpful hints and the instructions that came with the Holley pump and oil pressure switch. I mounted the pump on the passenger’s side frame and grounded it by wire brushing a spot on the frame and attaching the ground wire to one of the mounting bolts. All near the gas tank that I moved to the rear of the truck. The fuel line ran down the passenger side of the truck so that mounting position made quick work of mounting the pump and cutting the fuel line to insert the pump inline. I, too, bypassed the mechanical pump and left it in place and used brass plugs in the inlet and outlet ports. I ran the power line from the pump across to the driver’s side of the truck and up toward the cab following the gas gauge line. I took the time to make a wiring cover incorporating the fuel gauge line and the pump power line so that it looks neat entering the firewall. The power line from the pump went to one of the terminals on the Holley oil pressure switch.
I removed the existing oil pressure sender and I utilized a 1/8’’ pipe thread brass nipple inserted into the engine block where the old sender initially was, and a brass “T” to allow for the existing oil pressure switch and the new Holley oil pressure switch to be installed. With the diameter of the Holley pressure switch — it was good that I bought a standard and not a “close” nipple to insert into the block. The tolerances were really close — but I did get both senders installed into the “T”. A minor problem — when reattaching the original wire end to the existing oil sender — the wire broke — so I had to do a little splicing to make that work.
The other wiring was fairly simple — I made a short “jumper” wire from the starter solenoid starter wire to a terminal on the Holley oil pressure switch. Additionally, I utilized one of the “ignition on” terminals at the fuse block to deliver power to the remaining terminal of the Holley oil pressure switch. The way I understand this wiring configuration works, the power from the starter circuit allows the pump to run and move fuel until the oil pressure reaches a desirable level — then the “ignition on” circuit provides operating power for the pump. Still takes a while before starting due to changing the pump location but pressure wise, it appears to be exactly what I needed. I may consider a separate power switch instead of the starter circuit — to get fuel to the carburetor before engaging the starter.
