Starting at the beginning.../ Bought my '73 Spider a year ago, and wanted everything Right, so installed a new IAP fuel tank, and front and rear filters to protect the Spica injection. The fuel pressure light goes off a split second after ignition sw. turned/ fuel pump started. Engine runs well, except when high ambient temps- 90-100F. Then fuel light will come on during accel., climbing hills, etc. Engine will occasionally buck, as though starved for fuel. Have been told that there was a problem with vapor lock in Spica cars with in-line fuel pumps, and that weak fuel pumps would also show this characteristic. I replaced the fuel pump with the latest avail from IAP ( bought from Wes), changed the filters again, and put heat reflective covers over all the fuel lines, the fuel tank, muffler, and pipe, where they are close. Took the car on a quick mountain run- 60-70 miles at good speed, and everything was fine till I stopped for fuel, then the pressure light would come on every time I stepped on the throttle. Checked the filler cap; it was tight. Drove home, engine running fine, except the light coming on with any throttle. That evening I found that there were loose/old hoses at the vapor canister, and replaced them. I took off the fuel return fitting on the Spica block, filled the passage in the fitting with silver solder, and drilled a 1/16" hole. I replaced the pressure sender sw., and cleaned the relief valve in the filter housing. I have previously measured the pressure on a gauge 17 PSI running(prior to adding the solder to the fitting). Also have replaced the little plastic vent near the vapor canister, that prevents vacuum. I have noticed a bit of fuel on the fuel level sender, and what appears to be looseness of the electrical connections where they go through the bolted cover. I have not changed the fuel lines beyond the fuel pump and before the front filter. I have not traced any of the vapor return lines outside of the trunk area. Current situation is the fuel press. light comes on with any throttle, and my head is frazzled with thinking about it. Should the filler cap vent air with an audible sound after running? Is the entire fuel system to be at some pressure? Thoughts on this will save my sanity.