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10-08-2004, 05:55 PM | #1 |
Registered User
Join Date: Oct 2004
Posts: 3
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Closed Vent to Open Vent Fuel System
Greetings all, great board, been reading for about a week and would like to ask some advice. We inherited Dads 72 Chevy pickup C10, 350, AT. He was about 95% complete on a total restoration when he passed away. We'd like to finish it but I am undecided on one particular thing.
This model has the tank behind the seat. Its a small tank so Dad added a saddle tank on each side. Now there is a 15 gal on each side along with the 8 gal behind the seat. There is a switch that you turn to determine which tank to choose. There is one problem with this that was not thought out or finished. This model uses a closed fuel system. If you use the middle tank its fine. The problem is when you use one of the saddle tanks. The return builds so much pressure into the tank behind the seat, it could literally explode if you don't switch back to it or use it to relieve that pressure from the return. It would be difficult for me to put a return to whichever side tank I was using to keep the system a closed system. So I think I should open it, use a vented cap, and cap the returns to the tank behind the seat. What can I do about the fuel pump ? New one ? or cap the return for that ? If you have any other suggestions for this they would be appreciated. It would be really nice to eliminate that gas smell in the cab too, I am replacing some hoses and the fuel sending unit which didn't work, to get the gas guage back too. I don't have senders for the saddle tanks. Does anyone have a slick way to determine fuel levels in the saddle tanks ? Thanks in advance for all of your input. |
10-08-2004, 08:11 PM | #2 |
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Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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welcome to the board.....
well.....they make a 3 way valve that turns on each tank..... and yes there should be vented caps on the gas tanks no mater what..... just the sloushing of the gas will build pressure in the tanks.... i also have a 3 way switch that shows the fuel level in each tank....but i have senders in each one....... use a stick to check level,,,,or watch the mile'S ran on each tank ....or run it dry....and switch...... the RAGENRAT638 |
10-08-2004, 11:10 PM | #3 |
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Join Date: Oct 2004
Posts: 3
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What does everyone recommend with the fuel pump ? Can the return be pinched or plugged ? or do you recommend purchasing a fuel pump with with just an the single input line ? Thanks for your response
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10-08-2004, 11:38 PM | #4 |
Lovin' Life in Miss.!
Join Date: Mar 2004
Location: Puckett, Mississippi
Posts: 1,937
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Welcome from Northern California! Sorry to hear about your Daddy. Hope the truck lets you re-live all the good times..
I have a VDO sending unit in my aux tank. Use whatever brand you want. Think it uses 0-90 ohm sweep. Went electric fuel pump on mine, no more oil leaks at the fuel pump. Vented cap on both tanks. Capped of my return lines.
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The truck... you hear that? No really, you did hear that?!!! |
10-09-2004, 04:24 AM | #5 |
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Join Date: Dec 2002
Location: Tampa
Posts: 1,191
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You could always run a charcoal canister. The three tanks in and one out (to a vacuum source). That would keep your fuel system closed. They also make check valves that allow pressure through but not gas. It would mean running a vent line off each tank though. And welcome!
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'68 Short Step LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc |
10-09-2004, 07:05 AM | #6 |
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Join Date: Dec 1999
Location: BRADENTON FLA
Posts: 3,269
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Brian e-mail your e-mail address the pm is not working for some reason.
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Rest in Peace Ed. Thanks for all the good times. |
12-29-2004, 05:33 PM | #7 |
Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
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I have a similar problem. Did you end up going vented or closed system?
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