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. |
emerygt350 |
Jul 15 2024, 04:56 AM
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#2
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Advanced Member Group: Members Posts: 2,403 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I have found that as long as the fuel is vapor the pump is useless (as mentioned above). I suspect this is nothing more than that. Never really figured out why it takes so long for liquid to get back to the pump but I bet it has to do with the fact it's gravity fed from the tank. After the line is full of air from the firewall forward, and the pump is inoperable, it takes a long time for the gravity fed cool fuel to creep back to the pump, displacing that air or pushing it through the pump and return line.
Anyway, I would start with the simplest fix and put some heat wrap on those lines. I don't think you should cover the pump though. It does use the fuel to cool itself but I think letting it radiate its own heat is probably better for it than wrapping it in a blanket. It's also tough to reach anyway. |
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