amc 258 vapor lock - JeepForum.com

 
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post #1 of 4 Old 05-12-2009, 08:51 PM Thread Starter
buZZBomb_
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amc 258 vapor lock

after searching this forum for a few days vapor lock is the logical diagnosis.but i will appreciate any input or advice,so thank you guys in advance for your help.heres whats going on,lately its been warm here 65 or so.going for a spin,ill get 6 miles from home and engine dies,while accelerating,or at a stop.before it dies the rpm gauge bounces with no noticable change in rpms,then itll die.the first time i can usually start it rite back up.but after that,i have to wait 5 mins.my fuel line goes from the mech pump over the head to the carb(webber k551)with the fuel filter sitting just inches from the headpipes.reminding you this was never a problem a few months ago when roads are wet and ambiant temp around 45-55.but does that have anything to do with it?


88 yj 4" lift 33"s~wheeler.2000 wj 2.5" lift 31"s~urban anarchy rig/DD. 98 xj bone stock
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post #2 of 4 Old 05-13-2009, 02:54 AM
scottymac62
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Sounds like a blocked fuel vent line?

'77 CJ-5 Renegade 304 / T-150, Dana 20, 30/20 axles, Aussie Locker in the Dana 30, American Racing 15x10 Outlaw II's, 33" Dynapro M/T's" ,Optima Battery, TeamRushed + Summit Racing CDI ignition, FlowKooler water pump, Edelbrock Performer Intake Manifold, Holley 4160 390cfm, Herculiner, Silver Ceramic Coated Hedman Hedders, Flowmaster 40's.
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post #3 of 4 Old 05-13-2009, 03:42 AM
John Strenk
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Quote:
Originally Posted by buZZBomb_ View Post
after searching this forum for a few days vapor lock is the logical diagnosis.but i will appreciate any input or advice,so thank you guys in advance for your help.heres whats going on,lately its been warm here 65 or so.going for a spin,ill get 6 miles from home and engine dies,while accelerating,or at a stop.before it dies the rpm gauge bounces with no noticable change in rpms,then itll die.the first time i can usually start it rite back up.but after that,i have to wait 5 mins.my fuel line goes from the mech pump over the head to the carb(webber k551)with the fuel filter sitting just inches from the headpipes.reminding you this was never a problem a few months ago when roads are wet and ambiant temp around 45-55.but does that have anything to do with it?
The tach bounces before it dies? No noticable change in RPM? Hmmmm... fuel problems won't do that. I wonder if your ICM is starting to fail now that it's getting warmer out.
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post #4 of 4 Old 05-13-2009, 01:07 PM Thread Starter
buZZBomb_
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Quote:
Originally Posted by scottymac62 View Post
Sounds like a blocked fuel vent line?
are you refering to the return line from the filter,what if i deadhead it? just put a regular in and out filter on.or is the fuel vent line another deal.

88 yj 4" lift 33"s~wheeler.2000 wj 2.5" lift 31"s~urban anarchy rig/DD. 98 xj bone stock
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