Fuel Lines 68 cab to a 71 chassis - The 1947 - Present Chevrolet & GMC Truck Message Board Network

magwakeenercew2jh · 10-18-2010, 01:54 AM

Got the motor in the frame today. A couple of notches for the headers. Some questions arose over the fuel tank from the '71 that I'll be using in the '68 cab that has '71 "Everything Else"

I believe the '71 has the EEC fuel tank. It had the vent tube running up the back space behind the passenger in the cab, which I removed and kept, the canister next to the battery box in the engine bay, which I jettisoned, and a mess of fuel lines running from around the fuel pump to the back.

One , in particular, seems strange. It's *outside* the front frame rail and curves up looking to accept a rubber hose (to the cannister?). I think I can figure that there is a feed from the tank (goes back thru the cab floor?), a "return", and a "vent". Is it ba good guess that all three of these hoses go back to the fuel tank and up thru the floor of the cab? The '71 cab (gone to the rust collector/squisher), had two holes in the cab floor, and the '68 has only one.

So, what do I actually need? All three? Which is which? I looked on the explosion on LMC and I can't be sure. I'd really like to just use the supply line and whatever else is ABSOLUTELY necessary. Whatever that would be.

Thanks.

Here's the sparks flying today. The gas is turned off (moved outside) and our eyes and ears are covered.

usmcchevy · 10-18-2010, 02:53 AM

Too dark right now to go look for sure, but if you look at the charcoal canister the ports are marked. One line goes to the tank, one to the PCV and another to a vac port on the carb. Hope this helps.

Hubscrub · 10-18-2010, 08:11 PM

my 71 has one line to pump and the other line is just a vent under the cab now

raycow · 10-19-2010, 05:31 PM

Quote:

Originally Posted by magwakeenercew2jh

I'd really like to just use the supply line and whatever else is ABSOLUTELY necessary. Whatever that would be.

In that case, you dont NEED to install the canister. It is part of the emission control equipment, and in CA I believe a 68 model year vehicle is exempt from emissions testing.

Ray

crakarjax · 10-20-2010, 09:09 PM

I'm doing the same exact thing, and my current plan is to use a '68 sender (or EEC sender with the vent outlet capped) and get a vented gas cap for my '72 tank. I have yet to hear form anyone that that would be a good way to go and I haven't located a vented cap that will fit.

10-18-2010, 01:54 AM	#1
magwakeenercew2jh RAT1968 '68 Cab/'71 Parts Join Date: Feb 2002 Location: Coarsegold, CA Posts: 2,375	Fuel Lines 68 cab to a 71 chassis Got the motor in the frame today. A couple of notches for the headers. Some questions arose over the fuel tank from the '71 that I'll be using in the '68 cab that has '71 "Everything Else" I believe the '71 has the EEC fuel tank. It had the vent tube running up the back space behind the passenger in the cab, which I removed and kept, the canister next to the battery box in the engine bay, which I jettisoned, and a mess of fuel lines running from around the fuel pump to the back. One , in particular, seems strange. It's outside the front frame rail and curves up looking to accept a rubber hose (to the cannister?). I think I can figure that there is a feed from the tank (goes back thru the cab floor?), a "return", and a "vent". Is it ba good guess that all three of these hoses go back to the fuel tank and up thru the floor of the cab? The '71 cab (gone to the rust collector/squisher), had two holes in the cab floor, and the '68 has only one. So, what do I actually need? All three? Which is which? I looked on the explosion on LMC and I can't be sure. I'd really like to just use the supply line and whatever else is ABSOLUTELY necessary. Whatever that would be. Thanks. Here's the sparks flying today. The gas is turned off (moved outside) and our eyes and ears are covered. Attached Images __________________ M17 Coarsegold, CA RAT's shiny now. But always a rat. Last edited by magwakeenercew2jh; 10-18-2010 at 01:55 AM.

10-18-2010, 02:53 AM	#2
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: Fuel Lines 68 cab to a 71 chassis Too dark right now to go look for sure, but if you look at the charcoal canister the ports are marked. One line goes to the tank, one to the PCV and another to a vac port on the carb. Hope this helps. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index Last edited by usmcchevy; 10-18-2010 at 02:54 AM.

10-18-2010, 08:11 PM	#3
Hubscrub Cruzin Join Date: Dec 2009 Location: on the road Posts: 2,835	Re: Fuel Lines 68 cab to a 71 chassis my 71 has one line to pump and the other line is just a vent under the cab now __________________ Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14

10-20-2010, 09:09 PM	#5
crakarjax Registered User Join Date: Dec 2009 Location: Kirkland, WA Posts: 1,302	Re: Fuel Lines 68 cab to a 71 chassis I'm doing the same exact thing, and my current plan is to use a '68 sender (or EEC sender with the vent outlet capped) and get a vented gas cap for my '72 tank. I have yet to hear form anyone that that would be a good way to go and I haven't located a vented cap that will fit. __________________ 1968 LWB C20 / AC / Wood Bed



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