The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

Nick_R_23 · 07-19-2020, 08:34 PM

Gas pedal cleaned and painted. This was a chore to scrape and wipe out every single little groove on this thing!

All pedals finally mounted in place!

Started mounting the fuel tank relays and harness.

I decided that since I'm going to go with a hydroboost setup, I should add a cooler to the system, since my 2002 1500HD utilizes one. I happened to have a spare one and modified it a bit. I cut off the lines and flared them for 3/8" line.

Rear standoff:

Mounted in all it's glory!

Next up, the fuel system. I capped off the return ports on the Pollak valve as they won't be used with the Holley returnless system.

The main harness ran from the firewall:

And around to the passenger side. Tank switching valve also mounted!

Inner fuel lines and wires ran on the passenger side:

Passenger side tank completely mounted!

I reused the grommet that originally would house the sending unit wires on the stock tanks for running the vent lines through the frame and tying them together. I will have to pick up more line, but it will run towards the back and terminate at about the same height as the rear axle vent line.

Driver's side fuel tank is mounted and wiring ran:

Both tanks fully installed, wired, and plumbed! I still need to pick up a new terminal for the ground wire near the switching valve.

Shiny new filler necks! This definitely won't match the rest of the truck

Passenger side:

Driver side:

07-19-2020, 08:34 PM	#41
Nick_R_23 Registered User Join Date: May 2016 Location: Willow, Alaska Posts: 839	Re: 1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins! Gas pedal cleaned and painted. This was a chore to scrape and wipe out every single little groove on this thing! All pedals finally mounted in place! Started mounting the fuel tank relays and harness. I decided that since I'm going to go with a hydroboost setup, I should add a cooler to the system, since my 2002 1500HD utilizes one. I happened to have a spare one and modified it a bit. I cut off the lines and flared them for 3/8" line. Rear standoff: Mounted in all it's glory! Next up, the fuel system. I capped off the return ports on the Pollak valve as they won't be used with the Holley returnless system. The main harness ran from the firewall: And around to the passenger side. Tank switching valve also mounted! Inner fuel lines and wires ran on the passenger side: Passenger side tank completely mounted! I reused the grommet that originally would house the sending unit wires on the stock tanks for running the vent lines through the frame and tying them together. I will have to pick up more line, but it will run towards the back and terminate at about the same height as the rear axle vent line. Driver's side fuel tank is mounted and wiring ran: Both tanks fully installed, wired, and plumbed! I still need to pick up a new terminal for the ground wire near the switching valve. Shiny new filler necks! This definitely won't match the rest of the truck Passenger side: Driver side: