idrivea2002golf
Junior Member
- Joined
- Feb 19, 2025
- Posts
- 17
- Reaction score
- 26
- Location
- San Diego
- First Name
- Spencer
- Truck Year
- 1981
- Truck Model
- C20
- Engine Size
- Not sure yet.
I'm reaching to the forum for recommendations/feedback/thoughts on fueling systems. I've been on the different square body forums looking up the function of the dual tank and the Pollack valve. Seems pretty straight forward. I don't like that it relies on the suction from the engine's mechanical pump for priming, I'd like to have a more proactive fuel supply. For reference truck is a 1981 so I have the 6 port with the motorized valve. I'm currently planning on swapping in a 7.3 idi out of a 90 F350.
Here's where I'm looking for feedback, as I see it I have two options:
Option 1: I keep the existing system as it is (obviously check for functionality and replace anything broken). Use the ON-OFF-ON momentary on the dash for the switching as it already does. In this case I would add an in-line fuel pump (diesel style) between the Pollack valve and the engine's mechanical pump. This would tie into the ignition system. Simplest option but I know these pumps make noise and I don't know if I'm going to want to hear it all the time. Chineseum pumps are 20-30$, Holley or AEM are 200ish.
Option 2: swap the fuel senders I currently have (1981 models) with senders/pumps from 1987+ and basically run two in tank pumps through the Pollack valve. This would require I swap the dash switch which isn't all that difficult. I like that this gives me pump redundancy as the in-line pumps can be fickle. Obviously more up front cost but really not terrible in the grand scope of this build. From my understanding the wiring is the same between the 1981-1986 and 1987+ at the valve, just need to tie in the sending pumps power lines. This also gives me the flow/pressure required for a diesel as I can get the 6.2 in tank pumps. Each pump is about 110$ on rockauto. So similar price to a quality (Holley) inline.
Option 3: something I'm not seeing?
Here's where I'm looking for feedback, as I see it I have two options:
Option 1: I keep the existing system as it is (obviously check for functionality and replace anything broken). Use the ON-OFF-ON momentary on the dash for the switching as it already does. In this case I would add an in-line fuel pump (diesel style) between the Pollack valve and the engine's mechanical pump. This would tie into the ignition system. Simplest option but I know these pumps make noise and I don't know if I'm going to want to hear it all the time. Chineseum pumps are 20-30$, Holley or AEM are 200ish.
Option 2: swap the fuel senders I currently have (1981 models) with senders/pumps from 1987+ and basically run two in tank pumps through the Pollack valve. This would require I swap the dash switch which isn't all that difficult. I like that this gives me pump redundancy as the in-line pumps can be fickle. Obviously more up front cost but really not terrible in the grand scope of this build. From my understanding the wiring is the same between the 1981-1986 and 1987+ at the valve, just need to tie in the sending pumps power lines. This also gives me the flow/pressure required for a diesel as I can get the 6.2 in tank pumps. Each pump is about 110$ on rockauto. So similar price to a quality (Holley) inline.
Option 3: something I'm not seeing?
