77 k 20
Junior Member
- Joined
- Nov 21, 2023
- Posts
- 14
- Reaction score
- 7
- Location
- 89445
- First Name
- ken
- Truck Year
- 77
- Truck Model
- K20 Bonanza
- Engine Size
- 350
I have a 77 K20 350 eng that has dual tanks and HAD a 6 port single wire transfer valve that took a dump and was replaced with a 3 port single wire. Figured what were supply lines that went to valve and then return line and vents which were hooked together by what they did. The engine has a Carter 3 line fuel pump. Now to the issue when driving with both tanks full fuel will go from the right, main, tank that I'm running on to the left, aux, causing it to overfill. I know how the valve works running off main compared to aux. Question: So if I run my aux tank first will that solve my issue or cause the main tank to overfill?
I did this same set up in my 72 K10 using a Blazer tank and the factory cab tank with a 2 line engine mounted fuel pump. On those tanks the sending units had 2 connections supply and return as the 77 has 3 supply return and vent.
Here's my thoughts now. Leave the 3 valve in place, take the return and vent lines and separate them so that they vent to atmosphere and replace the engine mounted 3 line fuel pump with a 2 line version. It worked well on the 72 for over 40 years.
Thoughts?
I did this same set up in my 72 K10 using a Blazer tank and the factory cab tank with a 2 line engine mounted fuel pump. On those tanks the sending units had 2 connections supply and return as the 77 has 3 supply return and vent.
Here's my thoughts now. Leave the 3 valve in place, take the return and vent lines and separate them so that they vent to atmosphere and replace the engine mounted 3 line fuel pump with a 2 line version. It worked well on the 72 for over 40 years.
Thoughts?
