Fuel Pickup

Frankie · Mar 5, 2021

Doing a frame off on my '89 square body. Swapping a carb'd 454 for the 350 tbi. Tanks and pumps are junk so along with everything else they are being replaced. My question is since the tbi needed the return line hence the 3 port pickup, can I switch to the 2 port since I don't need the return line? Also is the 6 port tank selector switch usable or will that need to be changed to the 4? Getting parts to put her back together and the less plumbing the better. lol

HOTFOOT · Mar 5, 2021

My 80 k3500 400 sbc has 3 port sending units, just get a 3 port pump and sending units they say it is less likely to vapor lock.

75gmck25 · Mar 5, 2021

GM also used a return line on carbureted trucks ( my ‘75 has one) because having the fuel return instead of dead-heading at the pump keeps the fuel cooler and helps prevent vapor lock. Squarebody body engine compartments are large and usually aren’t as hot as a smaller vehicle, but vapor lock is still possible.

Bruce

Frankie · Mar 5, 2021

Didn't even think about vapor lock, had that happen in the past. Not fun. 3 port it is, thanks.

Fuel Pickup

Frankie

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HOTFOOT

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75gmck25

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Frankie

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