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. |
GregAmy |
Jul 14 2024, 07:43 PM
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#2
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Advanced Member Group: Members Posts: 2,370 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
With a recirculating fuel system...can a 914 **really** get vapor lock?
Dead-end fuel system with carbs, sure. But L- or D-Jet...? Discuss. |
wonkipop |
Jul 14 2024, 07:59 PM
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#3
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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 |
With a recirculating fuel system...can a 914 **really** get vapor lock? Dead-end fuel system with carbs, sure. But L- or D-Jet...? Discuss. it can definitely boil fuel due to the heat radiation from the fan casting. my theory has always been that where it boils is in the fuel supply line running from the exit at the rear of the tunnel to the pump. it can also boil in the plastic fuel filter pre the pump. and possibly in the pump head itself. this is in a stock set up. with boiled fuel you get pump cavitation. i had it from time to time with my original fuel pump years ago. after recommissioning i had to fit a modern turbine pump to replace the original. the problem became more frequent with that pump than it ever was 20 years ago. i wrapped them all in insulation shielding and the problem seemed to cease. though occassionally i can hear the newer pump cavitate on a hot start. but it seems to cope and settle down after a short while. the modern pump is positioned in the stock 74 location under rhs of engine bay. |
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