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Unread 07-26-2014, 06:12 PM   #1
little79cj
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Vapor locked

Been goin through this recently in this wonderful louisiana heat and askin for suggestions on how to combat it. I've got some hood louvers on the way and I was lookin for anything else to help when I thought " hey i'm sure somebody tried puttin their gas in the fridge before", found fuel coolers, and am wondering if its a good idea or just too much money/effort to be worth it.

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Unread 07-26-2014, 06:28 PM   #2
Mike Romain
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What engine? If you have a stock gas filter installed level with the right side up with the return line at the top you can't get vapour lock.
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Unread 07-26-2014, 06:30 PM   #3
little79cj
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258. ill post a pic just for simplicity sake
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Unread 07-26-2014, 06:44 PM   #4
little79cj
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I did not know they had to be level. well i guess my question has been answered.
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Unread 07-26-2014, 06:50 PM   #5
little79cj
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So is the return line in the right place I just need to get the filter level? Also I apologize for the sideways pic dont know how to get em right side up yet.
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Unread 07-26-2014, 06:52 PM   #6
wellmax
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I would raise the fuel filter up some.


here are some old school methods of dealing with vapor locking.
do not know if any would help you, but they did not cost you anything.
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1st..be sure its not vapor locking in the fuel lines...are the fuel lines close to the exhaust manifold or engine block for too long of a run?

2nd..a heat sink under the carb can help..and a non metalic spacer to move the carb up off the manifold some..

I have seen where guys will machine a thin aluminum plate to go under the carb to disapate the heat

I have also seen a number of clothes pins added to a fuel line to disapate heat..and tin foil on fuel lines..the list goes on


also check your timing, an engine out of time will run hotter!!!!!!


do you have the fan shroud around the fan, this shroud direct air through the radiator and helps keep the motor cooler, if you have an fan clutch it could be defective and letting your engine get hotter.


just a couple of items to look at. are you running anti freeze or just straight water in cooling system?
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Unread 07-26-2014, 07:00 PM   #7
little79cj
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Check on the raising of the filter. The fuel return line basically sits on top of the exhaust, so i've been suspicious of this raising the temp of the fuel in the tank. I do need to invest in a fan shroud. Using coolant 50/50.
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Unread 07-26-2014, 07:13 PM   #8
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Is the return line resting on/near exhaust sufficient enough to eventually cause vapor lock? Sandy(the jeep) runs perfectly fine for about the first hour then she starts hiccuping and stuttering. Usually when im sitting still or driving slowly. Highway driving and cool weather runs like a dream.
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Unread 07-27-2014, 05:14 AM   #9
Mike Romain
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Quote:
Originally Posted by little79cj View Post
Is the return line resting on/near exhaust sufficient enough to eventually cause vapor lock? Sandy(the jeep) runs perfectly fine for about the first hour then she starts hiccuping and stuttering. Usually when im sitting still or driving slowly. Highway driving and cool weather runs like a dream.
Yes if the return is too close to the exhaust it can cause vapour in the wrong place. It usually just drops down a little, then scoots over close to the wheel well. Same deal with the input line being higher than the return line, vapour can collect there rather than get blown off the back top corner to the return.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 07-27-2014, 07:40 AM   #10
little79cj
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Ok. Thanks for the help guys. Gotta wait for the next paycheck before I can implement these controls.
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Unread 07-27-2014, 08:45 AM   #11
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Vented gas cap? On really hot days I swipe 1/2 bags of ice from the outside freezers for the Air Gap intake
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Unread 07-27-2014, 09:32 AM   #12
little79cj
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Yes I invested in the vented gas cap when I was on my way down to florida on leave when I heard pangs and booms comin from the back of the jeep. Scared the bujeezus outta me.
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Unread 07-27-2014, 09:49 AM   #13
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I think id be a little scared to throw a bag of ice on a hot engine personally. Unless you prefer cube by cube. Has anyone here tried an electric fan setup and if so how much better is it than just mechanical fan?
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Unread 08-01-2014, 09:24 PM   #14
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I have been payed, so controls are being implemented. Does this look a little better mike?
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Unread 08-01-2014, 09:58 PM   #15
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Looks better, make sure your canister filter is not plugged up too. The purpose of the return line filter is to prevent vapor lock, in a single inlet/outlet line; heat boils the gas creating an air pocket (vapor lock) so fuel doesn't flow. The return line allows the vaporization to return back to the tank where it turns back to a liquid. Check that the return line also isn't plugged.
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