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Ask Canuck Tech Your Own Question
Canuck Tech
Canuck Tech, Technician
Category: Jeep
Satisfied Customers: 532
Experience:  20 years experience in tune up, electrical and general repair
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1980 cj7, straight six; cranks, runs like a sewing machine

Customer Question

1980 cj7, straight six; cranks, runs like a sewing machine till you drive a bit, used to be an hour, but now immediately. Acts like its starving for fuel. We have inspected carb, its clean and slick; replaced fuel lines, filter, pump, coil, dist. cap. Suggestions
JA: When did you last fill the tank? And do you smell gasoline around the engine?
Customer: this has been going on for weeks, with various stages of fuel in the tank and no, we do not smell gas
JA: Are you fixing your CJ7 yourself? What have you tried so far?
Customer: 1980 cj7, straight six; cranks, runs like a sewing machine till you drive a bit, used to be an hour, but now immediately. Acts like its starving for fuel. We have inspected carb, its clean and slick; replaced fuel lines, filter, pump, coil, dist. cap. Suggestions
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 4 months ago.
Category: Jeep
Expert:  Canuck Tech replied 4 months ago.

Hi there. A couple things come to mind. It could be starving for fuel. It could be something as simple as the fuel tank not venting properly, and you could verify this by removing the fuel filler cap when it starts to run poorly. If you hear a whooshing noise as you remove the cap, the tank is no longer venting properly,and the engine ends up starving for fuel. Another possibility is the pick up coil in the distributor gets warm and delivers an intermittent signal to the ignition module. That would cause the symptoms you have described. When it acts up, pull over, remove the air cleaner, and move the throttle linkage. You should see some fuel squirting into the carb. Engine off for this one. Hope that gives you some ideas. Canuck

Expert:  Canuck Tech replied 4 months ago.

Hi there - any progress on the Jeep?