'72 c10 suction from new fuel pump question "help please" - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1BAD65 · 07-20-2016, 06:53 PM

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snipescastle2 · 07-20-2016, 07:15 PM

Did you by chance replace the "Sock" or pre filter on the sending unt? the only other thing that might be a possibility here, is the rubber hose that the sending unit attaches to the metal line that passes through the floor.if it's dry rotted, it might be sucking air.....
HTH
Ben

swamp rat · 07-20-2016, 07:23 PM

Disregard question 1. Does not apply here if you have a stock system.

So you replaced all the rubber lines, are you sure you used Fuel Line and not a cheaper non reinforced rubber tube, i ask because under the cab is a short piece of rubber connecting the tank to the steel line, if you used a non fuel rated rubber hose then it could collapse via the pumps suction.

If your system had 2 lines off the tank then one should be a vent i believe so yes check and see if you didn't swap them.

Other things to double check.

Are you sure you didn't reverse the inlet and outlet ports?

Did you replace the pick up tube and sock?

Did you make sure the steel line was not plugged with debris before reinstalling the rubber hose?

07-20-2016, 06:53 PM	#1
1BAD65 Registered User Join Date: Jan 2012 Location: Madera,CA Posts: 111	'72 c10 suction from new fuel pump question "help please" Delete Last edited by 1BAD65; 07-20-2016 at 07:14 PM.

07-20-2016, 07:15 PM	#2
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: '72 c10 suction from new fuel pump question "help please" Did you by chance replace the "Sock" or pre filter on the sending unt? the only other thing that might be a possibility here, is the rubber hose that the sending unit attaches to the metal line that passes through the floor.if it's dry rotted, it might be sucking air..... HTH Ben __________________ "Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”

07-20-2016, 07:23 PM	#3
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: '72 c10 suction from new fuel pump question "help please" Disregard question 1. Does not apply here if you have a stock system. So you replaced all the rubber lines, are you sure you used Fuel Line and not a cheaper non reinforced rubber tube, i ask because under the cab is a short piece of rubber connecting the tank to the steel line, if you used a non fuel rated rubber hose then it could collapse via the pumps suction. If your system had 2 lines off the tank then one should be a vent i believe so yes check and see if you didn't swap them. Other things to double check. Are you sure you didn't reverse the inlet and outlet ports? Did you replace the pick up tube and sock? Did you make sure the steel line was not plugged with debris before reinstalling the rubber hose? __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

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