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| | | Joined: Dec 2014 Posts: 357 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 357 | So I'm going to install a Elect fuel pump to feed my Weber carb. First thing I realize is I'll need a "return line" to relive pressure.
Now sense the supply line is just under Head Pressure. And mounted high enough to where the Head pressure is negative. Why can't I just tap back into that line for the return.
Julian Carter
1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
| | | | | Joined: Dec 2014 Posts: 357 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 357 | OK so what are y'all installing for a fuel pump
Julian Carter
1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
| | | | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | Generally you don't need a return line. Late model fuel injection systems require a return but that shouldn't apply in your application.
In most cases it is better to mount the electric pump near the tank and it is also a good idea to use a fuel pressure regulator.
Both of these items can be obtained from most auto parts stores in both 6 and 12 volts. Electric pumps not unlike mechanical pumps sense pressure and will bypass. You can also use an electric pump to supplement a mechanical pump.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Apr 2008 Posts: 99 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 99 | to your first question, just a comment: even when running a return line into a surge tank reservoir, there is another return line going to the main fuel tank. i run Two fuel pumps in the tank. switch the wire, if fuel issues occur. | | | | | Joined: Mar 2010 Posts: 10,272 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,272 | Whenever I use an electric fuel pump, I prefer to use a pressure regulator which has a port for a return line. This has the added benefit of creating a continuous flow of fuel through the system, keeping the fuel cool, preventing vapor lock.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Dec 2014 Posts: 357 'Bolter | | 'Bolter Joined: Dec 2014 Posts: 357 |
Julian Carter
1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
| | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | Power the electric pump with an oil pressure sensing switch to prevent flooding in case the engine stalls. I've seen numerous incidents of a crankcase full of gasoline and gas dripping out of the tailpipes from a fuel pump that kept running because of an ignition switch left on after an engine stop. That's also a good way to blow the valve covers off the engine from a crankcase full of gasoline vapors.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | Hey Jerry, I installed a low pressure fuel pump near the gas tank on a momentary switch for vapor lock problems. The mechanical fuel pump is very high on this motor and it is known to suffer fuel starvation when hot in stop and go traffic. You see any problems?
Another problem my buddies and I have with Edlebrock carbs comes after weeks of no running of motor. We have to crank the motor for 20 or so seconds to get fuel back into carb. Would a 6 to 8 pound fuel pump near the tank on a momentary switch help this problem?
Last edited by beltfed; 10/10/2015 1:12 PM.
Six volt guy living in a twelve volt world
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