[G.M.]

The pumps on most other make cars a mounted down near pan so fuel when draining back isn't going to have the syphon effect. This may be why Marv didn't need a check valve. It also don't have to lift as high when restarting. I don't like electric pumps because of the mounting under the car where you can't see it, more connections, pressure which in most cases requires another component, a regulator, and reliability. If a straight switch is used possible gas in the oil and if there is a leak it pumps more fuel. The pump with the return cooled the pump from 135 down to 116 in a few seconds. I don't sit there cranking on the starter when it don't start after a few turns. I will drive it later and do some more temperature tests if I can get it to VL. I have to got to Radio Shack to pick up a transformer for another project and will get a can of the cooling spray, Maybe it's Freon?? Modern cars with electric pumps have return lines eliminating some of the objections I have listed. G.M.