starting issue with mostly stock 318

I covered this many times. You need a return, The needle and seat cannot work due to the boiling fuel. and the pressure dead ended up against the needle. Been there with many carbureted cars. With a mechanical pump you need a return filter pictured here being install on a 408 Barracuda.

for an electric pump you will need a return regulator second set of pictures 416 with a 100 gallon per minute electric pump.

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