1977 Ford F150 cranks but won't start (see details). Any ideas?

This 1977 Ford F-150 has gradually built up a "won't start after sitting for over a week" problem. Once it does start, it keeps starting perfectly all day -- and its on-road performance shows no signs of trouble; it runs great; no stalling, no roughness.

Its emissions seem fine…
2018 - HC 90 loaded, 171 idle / Cmox 0.09 loaded, 0.84 idle.

Though it's a 1977, it has only 126K miles on it; I bought it used in 1987. I've driven it sparingly since 1991, but I start & run the engine regularly to keep it in good shape. The last time it started was in early December 2018; I've tried various remedies (checking ground, etc.) since, with no luck. The battery is new, from January this year.

The last time major work was done on this truck was the late 1990s (carburetor overhaul, maybe other items); as far as I know, the ignition module is the same one as when I bought it in 1987; the plug-in connectors look very weathered on the outsides.

Suggestions will be appreciated!

Fuel pump

I've seen similar behavior in GM vehicles with Rochester 4 barrels that slowly leak the fuel out of the fuel bowl through the main jet drill passage plugs. Not sure if your carburetor is constructed in the same fashion though because you didn't tell us anything about the engine or carb type. Some of the old paper fuel filters also had a check valve to keep the fuel line from draining back to the tank.

Get the gmc sierra

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