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post #1 of (permalink) Old 06-19-2003, 06:58 AM Thread Starter
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Swapping fuel filter

Excellent site! Most thoughtful and informative I have yet to find. On to my question.
First the basics - 84 CJ7 with a 258 and a Weber carb. Minimal emissions, vacuum, etc. I want to replace the stock, 1 in 2 out, fuel filter with an inline in/out. Will the purge canister eliminate the chance of vapor lock or do I need to hook, cap or vent the other line that is on the fuel filter? I'd appreciate any tips. Thanks

Scott
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post #2 of (permalink) Old 06-19-2003, 09:25 AM
 
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Re: Swapping fuel filter

welcome to the board
stock fuel filter has (as you mentioned) one input port and two output ports. Input hooks up to the fuel delivery line from the gas tanks, one output goes to carb, and second output goes back to the tank (fuel return line carrying fuel back to gas tank). Also, one of the lines from the gas tank connects to the purge canister -- to catch vapors from the gas tank. If I understand correctly what you want to do, I would not change 1 in/2 out fuel filter with 1/1 and eliminate fuel return line.
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post #3 of (permalink) Old 06-19-2003, 10:11 AM Thread Starter
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Re: Swapping fuel filter

Why is this fuel return line so important? I have a fuel pressure regulator that limits the amount of fuel going into the carb. Won't any unused fuel return to the tank without it?
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post #4 of (permalink) Old 06-19-2003, 01:26 PM
 
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Re: Swapping fuel filter

How can any unused fuel be returned to the tank without a return line?

The one in, 2 out filter also helps to eliminate any air in the line from getting to the carb if the return line is properly positioned; that is with the filter turned so the return line is on top.

Ken Linzmeyer
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post #5 of (permalink) Old 06-19-2003, 02:18 PM Thread Starter
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Re: Swapping fuel filter

Good point. Looks like I'll be repositioning some more fuel line this evening. No matter, as bad as it gets I still enjoy the time I'm working on my CJ. Thank for the input.

Scott
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post #6 of (permalink) Old 06-19-2003, 06:11 PM
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Re: Swapping fuel filter

Someone can correct my ill thinking on this, but doesn't the additional fuel flow aid in preventing vapor lock. the fuel lines stay cooler, and disipate heat with the moving fuel.

I may be off base on this usage however.
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post #7 of (permalink) Old 06-19-2003, 08:07 PM
 
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Re: Swapping fuel filter

yes you are right
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post #8 of (permalink) Old 06-20-2003, 05:46 PM
 
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Re: Swapping fuel filter

I agree, I have a '76 Cj-5 with the AMC 360. and 4-barrel Truck Avenger carb. I dont run a return line, and have not experienced any vapor lock. But on my old set-up, double pump Holley, 4-barrel, I had many prob. with vapor lock.
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post #9 of (permalink) Old 06-21-2003, 08:38 AM Thread Starter
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Re: Swapping fuel filter

I just went ahead and rerouted the return line so it would not get in the way and hooked it back up. Been having so many problems setting the timing and getting rid of my dieseling on shut-off that I decided to leave it as-is.

Scott
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post #10 of (permalink) Old 06-21-2003, 02:12 PM
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Re: Swapping fuel filter

if its deisling make sure your idle mixture is set by the lean drop method. just fattening up the idle mixture only masks other problems. And if i remember correctly the 32/36 dgv weber should have a fuel cut solinoid that should be wired to a ign. hot. It cuts off fuel to the idle circuit when you turn off the key!my 3cents. [img]images/graemlins/40BEER.gif[/img]gas.
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