1956 Vapor Lock with Dual Outlet In-Line Fuel Filter? | Ford Thunderbird club group 1955-2005 T-Bird models

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1956 Vapor Lock with Dual Outlet In-Line Fuel Filter?

tovigba

tovigba

Bronze Member
Reaction score
1
Thunderbird Year
1956
I apologize in advance for posting yet another vapor lock question, but this has got me stumped. To remedy the issue, I replaced the stock glass fuel filter with a WIX dual outlet in-line fuel filter which returns excess carb fuel to the gas tank through a copper line that feeds into what was the gas tank drain plug opening. I filled the gas tank, drove around 12 miles on an 85-degree day and parked for an hour. Restarting the vehicle took a couple of try's, drove around 1,000 feet, then engine coughed and died. Got a tow home and then the next day the car started right up. This is almost exactly what happened with the old glass filter, and hence the vapor lock issue still seems present. I was told that the WIX dual outlet in-line filter system would eliminate any possible vapor lock. So, my question is why I would still have the issue. I am speculating that the gas tank being full is restricting the excess fuel from readily returning to the bottom of the gas tank through the drain plug hole? (Note that the gas cap does have a small venting hole). Or my fuel pump is not delivering enough fuel pressure for the dual outlet system to properly function? Anybody ever heard of this happening with a dual outlet fuel system? As always, thanks all.

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If you have the dual line fuel pump you do not need the filter with the return as that weakens the pressure to your carb. Do you have a heat spacer between your carb and your manifold? My Lincoln had same problem, the spacer fixed it.
 
Interesting, I will ask my mechanic about a heat spacer between the carburetor and the manifold. Thank you, this is helpful. Off the top of my head, there is a single fuel line going into the dual outlet in line filter. I’m also going to ask my mechanic to determine if there’s enough pressure going into the filter. But again, the heat spacer is an interesting idea.
 
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