Fuel System Return Line - Team Camaro Tech
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post #1 of 9 (permalink) Old Aug 8th, 08, 04:27 PM Thread Starter
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Brady
 
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Fuel System Return Line

Stupid question time: just ordered new fuel lines, tank to pump, and a new fuel pump. The question I have is does the return fuel line connect to the fuel pump and back to the tank? This is a 69 Camaro by the way, small block.
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post #2 of 9 (permalink) Old Aug 8th, 08, 05:39 PM
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Ron
 
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Re: Fuel System Return Line

I don't believe fuel reurn lines were installed into Camaros until 71 or 72 for Carbon Canisters which filtered Fuel Vapor and utilized pressurized fuel tanks. 69 and 70's had Vented Gas Caps. If you running an electric Fuel pump, I recommend a return line with a Pressure Gauge delivering a constant 6 to 8 PSI to the Carb. The return line with Gauge allows the pump to free wheel without cavitation and over heating due to dead end pressure and would guess easier on the fuel inlet valves of the carb.

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post #3 of 9 (permalink) Old Aug 8th, 08, 06:46 PM
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rick
 
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Re: Fuel System Return Line

the dual fuel line on the 69 camaro 350's were factory installed. the 3/8 line went into the mechnical pump and then up to the round canister filter setting above the water pump and the 1/4 return line goes to the top of the same filter. short peice of rubber hose between the frame and the steel line that goes behind the water pump and another short rubber hose between the steel line and the filter.there are some good pics on the forum if you do a search.
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post #4 of 9 (permalink) Old Aug 8th, 08, 07:18 PM Thread Starter
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Brady
 
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Re: Fuel System Return Line

Did a 302 or 396 have a return fuel system or was the 350 with a Quadrajet the only one? I have a manual on CD and it does not show one at all. I plan on running a stock fuel pump and an Edelbrock carb. Do I need a return system? What are the advantages and disadvantages?
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post #5 of 9 (permalink) Old Aug 8th, 08, 08:11 PM
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Jim
 
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Re: Fuel System Return Line

302 used Holley carb so no return line. Some 396's had the Roch Qjet and then had return line, the LM1 350/255 had Qjet and return line but that was discontinued around Jan.1 1969.
Thats why you see dual line fuel lines and filters offered by repro catalogs.
So YES there were camaros in 69 with return lines. I have one

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post #6 of 9 (permalink) Old Aug 8th, 08, 08:14 PM Thread Starter
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Brady
 
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Re: Fuel System Return Line

Is one recommended based upon my application?
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post #7 of 9 (permalink) Old Aug 8th, 08, 08:22 PM
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Don
 
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Re: Fuel System Return Line

Quote:
Originally Posted by Z15CAM View Post
I don't believe fuel reurn lines were installed into Camaros until 71 or 72 for Carbon Canisters which filtered Fuel Vapor and utilized pressurized fuel tanks. 69 and 70's had Vented Gas Caps. If you running an electric Fuel pump, I recommend a return line with a Pressure Gauge delivering a constant 6 to 8 PSI to the Carb. The return line with Gauge allows the pump to free wheel without cavitation and over heating due to dead end pressure and would guess easier on the fuel inlet valves of the carb.
Correct me here, but I think the regulator should be after the carb gets the 6-8 psi, then the regulator on to the return line. Like at the end of the fuel log. What I was doing when running an electric pump.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #8 of 9 (permalink) Old Aug 8th, 08, 08:36 PM
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Re: Fuel System Return Line

Dirtlover -

If you want to run the OE style GF432 filter ($48 for a repro, ouch), then get the 69 style feed and return. If you don't, then you'll have to use a pump to carb line from a 68 and make it work. I used a 68 BB feed for my 69, because I didn't want to spend the money for the "correct" setup. I had to alter some of the bends because it wasn't made to behind a passenger side alternator, but it was fairly simple.

The dual fuel lines were on Q-Jet equipped cars in 69, to deal with an issue I can't recall right now.

Do you have the dual line sending unit on the tank?

Eric
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post #9 of 9 (permalink) Old Aug 9th, 08, 05:18 AM Thread Starter
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Brady
 
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Re: Fuel System Return Line

I ordered the dual line sending unit but fortunately, one line is back ordered for about a week and nothing is being shipped until then. So, I am able to change the order before and will do so on Monday. This seems more of a problem than a cure for a problem in my case. Thanks for eveyone's help. More advice is always welcome.
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