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914World.com _ 914World Garage _ FUEL LINE REQUIREMENTS FOR CARBS
Posted by: OLAF Oct 14 2016, 08:42 AM
Hello All, I'm new to the 914's and this organization and like what I see. This group seems very devoted to the cars. Cosmetic restoration of my '71 was begun by the seller and nicely done. I've just begun the mechanicals. Seller had installed a 2.0 motor with Empi 44's.
I'm installing the gas tank but wonder if a Fuel Return Line to the tank is used? I know it was required for the FI setup. Can I just Cap off the "fuel line return port" on the tank?
The new system uses a Carter Electric pump, factory set at 4 psi. I plan to install a regulator and gauge set to 3.5 psi.
You feedback is greatly appreciated...
"OLAF" (Paul)
Posted by: Mark Henry Oct 14 2016, 09:08 AM
Either or...you can run it single line regulator before the carbs, or you can run it return and you place the regulator after the carbs. With a return circuit the line should loop like in a fuel injection system.
Posted by: N_Jay Oct 14 2016, 09:31 AM
A return line, even on a carb system reduces the chance for vapor lock.
A return line may be needed in the future if you even went back to FI for any reason. (Restoration or upgrade).
Posted by: porschetub Oct 14 2016, 12:55 PM
Running the same Carter pump regulated @ carbs to just over 3psi,no flooding issues,my pump is located on my front suspension beambeam with short line to tank suction,I like this idea because the pump has a head of fuel to it always.
My old FI fuel return is capped off @ the tank,I used the old return line in the tunnel to get power to the fuel pump.
I'am using low pressure FI fuel hoses with proper fuel line clamps for piece of mind.
Posted by: GeorgeRud Oct 14 2016, 04:44 PM
Just be sure tat the fuel line is labeled safe for ethanol laced fuels. I assume most should be these days, but it's best to check.
Posted by: Localboy808 Oct 14 2016, 07:20 PM
Either or...you can run it single line regulator before the carbs, or you can run it return and you place the regulator after the carbs. With a return circuit the line should loop like in a fuel injection system.
How would you run the return line like that? Return line on one end is to the tank. Where does the other end go? I'm not understanding.
Posted by: OLAF Oct 15 2016, 06:51 AM
Amazing,,, so many fast and quality replies to my query. Thank you all.
OLAF
Posted by: N_Jay Oct 15 2016, 07:42 AM
Either or...you can run it single line regulator before the carbs, or you can run it return and you place the regulator after the carbs. With a return circuit the line should loop like in a fuel injection system.
How would you run the return line like that? Return line on one end is to the tank. Where does the other end go? I'm not understanding.
You feed the carburetors with "T" fittings ten end the line with the regulator.
The regulator has a return line that goes to the tank.
Tank > Pump > Filter > Carb 1 > Carb 2 > Regulator > Return
Posted by: Localboy808 Oct 15 2016, 08:37 AM
Either or...you can run it single line regulator before the carbs, or you can run it return and you place the regulator after the carbs. With a return circuit the line should loop like in a fuel injection system.
How would you run the return line like that? Return line on one end is to the tank. Where does the other end go? I'm not understanding.
You feed the carburetors with "T" fittings ten end the line with the regulator.
The regulator has a return line that goes to the tank.
Tank > Pump > Filter > Carb 1 > Carb 2 > Regulator > Return
Ahh. Never used a regulator. No wonder! Thanks for the explanation!
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