Won't Start
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2nd Gear
Joined: Dec 2023
Posts: 2
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Won't Start
Hello everyone, I’m new and I came here to talk about my 1973 F100. About 22,000 miles ago I had my 360 replaced with a 360 Jasper motor. I’ve never had any problems until recently. In May of 2023 I went into the hospital and then into a rehabilitation center to recover from my operation. My truck ran great when I drove to the hospital. I had a friend move my truck to another friends house while I was in the hospital. At that time it ran just fine. It sat at this friend’s house for four months while I recovered from my operation. When I had the chance to get to my truck and four months, it wouldn’t start. My friend said he took the liberty to try and start it and in the process he said he dribbled gas down the carburetor to prime it which resulted in a flame that shot out of the carb. I verified I had spark, and rebuilt the carburetor. I am getting gas and air but it would start. I sprayed carb cleaner into the air filter and it started. I was able to get it started every week for a month sense then until last week. I still have spark, I’m still getting gas, the plugs are clean, I put a brand new battery in it, but it just won’t start. Any ideas.
Fleet Mechanic
Joined: Dec 2016
Posts: 1,259
Likes: 713
Since it ran before without issues I would focus on things that can go wrong from sitting. Do you have points/condenser? Points can corrode over time. Can be cleaned with a piece of cardboard or fine sandpaper. Fuel can go bad over time. You say you rebuilt the carb but old fuel can easily clog/block fuel passages. Also, rodent damage can cause endless problems. Compression, fuel, spark. I would rule out compression since was good running before. Fuel; I suspect a problem here since you've stated that it runs with starting fluid. Confirm that you are getting good fuel at the carb. Confirm good fuel flow from the pump. Set your eyes on all rubber fuel lines and check for damage, internal and external. Rodent damage can allow air to be sucked in to the fuel system. Spark; confirm spark at all cylinders. Again rodents can cause a lot of damage. You may have spark at the coil, but inspect all plug wires and even the wiring going to the distributor. A loose or worn wire can cause run/no run conditions based on even the slightest movement, sometimes even in places that aren't obvious.
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