Running fuel lines, rollover & checkvalve needed? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-02-2002, 09:39 AM Thread Starter
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Running fuel lines, rollover & checkvalve needed?

I am about to run the fuel lines in my '77 CJ-7, 304 and the rollover checkvalve and the other little canister are both toast. Should I replace these 2 parts or can I go w/out. If I do need them where can I get my hands on some? Thanks,

rich
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post #2 of (permalink) Old 01-03-2002, 01:51 PM Thread Starter
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Re: Running fuel lines, rollover & checkvalve needed?

Try this again. Thanks,

rich
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post #3 of (permalink) Old 01-03-2002, 01:55 PM
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Re: Running fuel lines, rollover & checkvalve needed?

If you are running EFI, I don't think you need a check valve in the fuel supply or return lines. I would be worried about the fuel pump still running though. They make special electrical switches that shutoff in a rollover-The ford instructions for my 5.0 EFI swap mentioned it. Also, I would put check valves in the vent lines, because without them, fuel will gush out if you tip over. I don't know where to get them though.

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post #4 of (permalink) Old 01-03-2002, 01:58 PM Thread Starter
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Re: Running fuel lines, rollover & checkvalve needed?

Thanks for the reply but this for a 1977 Cj w/304 and 2bbl Motorcraft carb (FI, I wish). The stock setup has a little canister and checkvalve that are up in the rear of the tub behind the taillights and mine are both rusted and broken. Thanks anyway,

rich
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post #5 of (permalink) Old 01-03-2002, 04:05 PM
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Re: Running fuel lines, rollover & checkvalve needed?

Well, Rich, I was getting occasional fuel leakage from mine. Both are now gone. I just ran a line from the extra spout off the gas tank up into the fender with a vent cap on top.

Type 6-"Woodlands" '82 CJ'7
Type 2-"Occasional 'froader" '96 ZJ
post #6 of (permalink) Old 01-03-2002, 10:58 PM
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Re: Running fuel lines, rollover & checkvalve needed?

I got rid of all of that stuff.Ran a single fuel line up to the stock mech. fuel pump.put on a single line generic inline fuel filter .Plugged the other nipples on the gas tank.Installed a vented gas cap.Have not had any problems, but i have'nt rolled yet either.Noone really knows the purpose of the "return" fuel line other than to possibly prevent "vapor lock". Marc

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post #7 of (permalink) Old 01-03-2002, 11:48 PM
 
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Re: Running fuel lines, rollover & checkvalve needed?

marc- were did you get the vented fuel cap? I need one to eliminate the same junk. thanks- Tim

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post #8 of (permalink) Old 01-04-2002, 12:20 AM
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Re: Running fuel lines, rollover & checkvalve needed?

On my 80 CJ5, I also needed to replace the rollover check valve, but was unable to get a factory replacement part. I ended up using a similar rollover check valve used by circle track racers. I seem to remember it was less than $10.
dave

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post #9 of (permalink) Old 01-04-2002, 12:24 AM
 
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Re: Running fuel lines, rollover & checkvalve needed?

Yeah, you should eliminate the rollover valves, right after you eliminate the roll cage, and get rid of those annoying seat belts. At least without the seatbelts, you wont be stuck in, a gas dripping heap.
On the other hand if you ever happen to find yourself and/or kids, freinds, loved ones, upside down in your Jeep, all of them will help save your life.

Jeff
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post #10 of (permalink) Old 01-04-2002, 12:53 AM
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Re: Running fuel lines, rollover & checkvalve needed?

Yeah, what Jeff said!

Seriously though, these "rollover" valves are there for a reason. If the Jeep turns over (I know, it will NEVER happen) these valves keep the fuel that was in the bottom of the tank, that is now in the top of the tank, from dumping out all over the ground/Jeep through the vent lines. And yes, you do need the vent lines to let air back into the tank, as your engine removes fuel or you will create a vaccum in the tank that your fuel pump will eventually not be able to over power. A vented gas cap can phisicaly replace the vent lines, but in most states its not emissions legal, and if you do any water crossings, the cap will not only let air in, but water as well.


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1983 CJ-7 Laredo
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