Join Date: Jun 2006
Thanked 2 Times in 2 Posts
Rep Power: 13
It's August. I would go with spider webs in the fuel vent line leading to a partial block, which leads to negative pressure in the tank, which the measly 2 PSI fuel pump is eventually unable to overcome.
It's essentially a stroke, in engine terms.
Clean out the goo.
I would vote for the coil failing due to high heat as a reasonable second cause, all else being equal. There are mods (put the coil off the block on the bulkhead, increase the cool air venting to the engine compartment) that can remedy this above and beyond getting a new coil, which is not a bad idea anyway.
I would also clean the carb (or the "crab" as the late, lamented Qshicks, demi-god of Atomic 4 maintenance, called them), but this could just be a band-aid if you actually require a carb rebuild...this can be done, but is fiddly, close work.
Lastly, you should check the tightness (and the doubling) of all clamps and seals in the fuel circuit. If you have a fuel/water separator, make sure it's relatively new, has a greased O-ring, and is dogged down properly. If air is getting in there, it's more a case of an embolism than a "blood clot". This includes torquing down the bolts holding the carb and fuel pump to the block...if a gasket here is failing or "seeping", that could also lead to the cumulative effect you describe, but is less likely IME.