I recently blew a head gasket, got everything put back together and now I have a fuel issue. The sled did have 3 year old gas in it but have now replaced it with fresh gas. The fuel pump will prime and prime after every pull to 37psi. I have also crimped the return fuel line after the regulator and still does not hold pressure. So I'm guessing the regulator is still good? Any other ideas? Injector stuck open?