Is this the dreaded 914 vapor lock?, Asking for your ideas and thoughts |
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Is this the dreaded 914 vapor lock?, Asking for your ideas and thoughts |
Artfrombama |
Jul 14 2024, 05:04 PM
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#1
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Member Group: Members Posts: 156 Joined: 21-January 24 From: Alabama Member No.: 27,870 Region Association: South East States |
Drove my 914 to a PCA function yesterday morning, 93f and humid.
After driving on the interstate at 70-75mph for around 45 miles I exited and the motor died. I had enough momentum and coasted into a gas station/convenience store where I topped off the tank and tried to restart the car, no luck. The car would fire, run a few seconds and die then refused to re-start for another 10-15 minutes then the same scenario again. No tools to diagnose or repair. While waiting on AAA for three hours (another story) I would occasionally try to start the car with the same results. Today, car started normally, runs normally. 1974 L-jet, original three bung fuel pump, original location. 500 miles on new tank, sock, filter, ss lines. |
wonkipop |
Jul 15 2024, 01:10 AM
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#2
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Advanced Member Group: Members Posts: 4,611 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
another tip @artfrombama that came to mind - just remembered something.
if the AFM plug is left unplugged the engine will fire, run for a second or two and quit. thats if all the fuel pump connection through the dual relay etc is factory original and the pump has not been rewired to run all the time as many have this many years down the track. basically the fuel pump will pressurize the fuel system on cranking from starter motor but as soon as it does fire the AFM takes over after the flap moves to control the pump. if its failing to take over because of no connection it will run briefly until fuel pressure drops. i wonder if your AFM plug or harness is playing up. dirty connection. or shook loose. or intermittent fault appears after getting warm and running for a good length of time. might be worth playing around jiggling plug and wire loom while the engine is idling. see if anything happens. |
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