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1961 CJ5 Fuel Delivery Issue

#1 User is offline   JeepNWilly 

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Posted 13 November 2007 - 10:01 PM

Not sure if I posted this in the right forum.
During this past Sunday's JW Cobett test run for my CJ5 I encountered an issue that cause the JEEP to stall after maybe 20 to 30 minutes of driving. I have always started and let it idle for some time on a weekely basis at home but this was the very first time I actually take on a trail. When it stalled I opened the hood and saw that the fuel filter was completely empty. I tried to crank it I could see the pump trying to pump fuel but did not fill the filter instead it seemed to bubble up air and fuel as id there was a leak some where. After about 20 min (engine cool) I looked at the filter and it was full again :2thumup: so I attempted to start it and all was good. After another 20 miutes samething happens. I waited about 10 min before trying to crank it and was able to get it it started but could see more bubbles in the filter. It also was having a hard time keeping the filter halfway full. Any ideas what could cause this strange issue, while cold the pump seem to fill the filter very rapidly but after 30 min or driving time it canot keep up with fuel volume required by the engine and has those bubbles as if there was a leak.

Sorry for the long story :tongue1:
Willy
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#2 User is offline   Rollbar 

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Posted 13 November 2007 - 10:38 PM

1. Tank Vent clogged
2. Pump going under demand from the engine. I want to say vapor lock but I don't think so.
3. U posted in the correct catagory
4. What engine etc.
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#3 User is offline   JeepinIan 

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Posted 14 November 2007 - 07:11 AM

Check the routing of the fuel lines. If too close to the exhaust or heat source it could boil and turn into a vapor lock.
Ian Stewart

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#4 User is offline   JeepNWilly 

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Posted 14 November 2007 - 10:01 AM

View PostRollbar, on Nov 13 2007, 10:38 PM, said:

1. Tank Vent clogged
2. Pump going under demand from the engine. I want to say vapor lock but I don't think so.
3. U posted in the correct catagory
4. What engine etc.


Checked tank vent and it is good
Engine is the original Hurricane F134
images below of engine compartment
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Willy
2006 Wrangler X , 2014 JK Unlimited Sport
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#5 User is offline   dave123 

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Posted 21 December 2007 - 07:03 PM

I give odds 10-1 that you have vapor lock. Try routing the line away from anything hot. My grandfather once fixed vapor lock by wrapping insulation
around the fuel line.
Make mine an old CJ with a V8 and no top!

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