Ray70
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2 other thing to check are: is the little G-17 strainer on the fuel pump. If you're using the same one ( assuming you still have one in place ) with both pumps you tested, make sure it's not clogged up.
Also, check your oil pressure and make sure it isn't abnormally high. If this does not turn out to be a fuel issue, check compression to be sure you aren't loosing compression as the push rods, rockers , valves and everything expand.
A stuck oil pressure relief valve can cause the lifters to pump up due to excess oil pressure and can float the valves. I'd be curious if you are border-line floating them at start up then as metal expands you eventually loose compression until everything cools off and shrinks down??
If you attempt to restart immediately after it dies, does if crank normally or sound a little too fast and somewhat lacking the compression pulses?
Also, check your oil pressure and make sure it isn't abnormally high. If this does not turn out to be a fuel issue, check compression to be sure you aren't loosing compression as the push rods, rockers , valves and everything expand.
A stuck oil pressure relief valve can cause the lifters to pump up due to excess oil pressure and can float the valves. I'd be curious if you are border-line floating them at start up then as metal expands you eventually loose compression until everything cools off and shrinks down??
If you attempt to restart immediately after it dies, does if crank normally or sound a little too fast and somewhat lacking the compression pulses?