Post by
AZhitman »
https://forums.nicoclub.com/azhitman-u113.html
Mon Jan 19, 2015 12:23 am
Peter's right, with regard to a carbureted car - However, IF you're experiencing stumbling while going up long uphill grades in high heat, driving in extreme heat, or other similar issues, check your fuel filter. EFI cars are not as susceptible to vapor lock issues, simply due to the nature of their fuel system design. I'd be looking at the fuel pump and filter, first. Fuel pump should be keeping a steady pressure of 30psi.
Also, isolating the fuel rail from its mounting points (with a plastic or aluminum spacer) and wrapping the line with heat-reflecting material won't hurt, but here's an easy way to know if you have vapor lock: If you run the car hard in warm weather, shut it off, try to restart after 2-3 min, and it won't start, you have heat soak / vapor lock.
I'm guessing you have a fuel delivery issue, not vapor lock.