Fuel pump lines

[Eric Wettschreck]

89 Chev 1/2 ton 4x4.

I just put a fuel pump in it and now I'm curious. This truck isn't in the greatest of shape so instead of dropping the tank I cheated and cut a hole in the bed. Installed a new pump and wiring harness.

Just to make sure before I hooked up any fuel lines I turned on the key and, thank God, fuel pumped out of the larger of the 3 lines. I'm too lazy to trace everything out. My question is, I understand the larger (3/8) line must go up to the carb to feed fuel. What do the other 2 (1/4) lines do? I'm guessing one of them is a return, and if that's so, what does the remaining line do?

Just curioius.

[Macgyver55]

One is the feed, one is return and the third is the vent line to the canister.

[Eric Wettschreck]

Sweet. Thanks Mac. Not sure why I wanted to know. Just curious I guess.

[Jeremy airjer W]

I can't believe you got the lines loose!

Did you check the connection on the inside of the sending unit for burnt pins?

[Eric Wettschreck]

I didn't get them loose, I cut em.

Yep. I checked for burnt pins. They looked fine to me. If they ever go sour I have an easy access port now.

[harvey lee]

Beats pulling the tank for sure. Been there and done that.

[croixflats]

Wish I would have thought of that before replacing the pump twice in my 89 chev. After the first replacement the new pump burnt out in the first month. Not fun on the side of the road with a 3/4 tank full.

[Jeremy airjer W]

I didn't get them loose, I cut em.

I should have known as soon as I saw "I cut a hole in the bed."

[Eric Wettschreck]

I believe in doing things the easy way.

[crothmeier]

haha i lifted the box off when i did it on my 97. unfortunatly i had spent the previous weekend on the lake ice fishing, and it went out on monday morning. the underside of the box was caked with ice and snow and was at least 100lbs heavier becasue of it.