Technical 1959 apache build ( help )

trying to bring my 1959 chevy fleetside apache back to life. has the 235 straight 6 with 3 on the tree.

having a problem with the gas tank building up a lot of pressure when trying to get it started. when i open the cap it ****s in a Burst of air. Any Ideas or tips?

I have already put in
New tank
New Fuel Neck
New lines from fuel pump to carb
new sending unit

 

Sounds like the gas cap isn’t venting. Try a vented cap.

 

pressure and vacuum are two different things. Watcha got goin on there ?

 

You can leave the cap loose or off to start the truck.

If you want help figuring out why it won't start, we'd probably need a lot more information....as it's pretty much unheard of for a gas cap to prevent an engine starting. Unless it already started, ran for a while, and stopped running due to fuel starvation.

 

When I did my 59 Apache, I took bought a new fuel tank with cap. My cap did not vent at all, building pressure when the gas warmed and expanded, vacuum when it cooled. Bought a new vented cap, problem gone. It would build so much pressure gas was forced into the bowls causing significant fuel leaks, flooding, not running.

There is a way to modify your cap to make it act vented to at least see if that's the problem. Searching will give you ideas.