Something strange was happening to the coupe. For extended driving trips, the oxy sensor would show my mixtures leaning out. On the highway, it was causing lean surge and I wanted to find out why.
I opened the boot to take some stuff out and felt that the swirl pot was quite warm, not really hot, but a long way from cool. I'd plumbed the return line back to the swirl pot and not the tank. The reason was that I wouldn't need the low pressure Carter pump to be as big as the EFI high pressure pump in terms of flow. The trade off is a loop is created. The fuel can cycle, picking up heat from the engine bay on its way around.
I thought about a cooler with a fan in the boot but I decided that I needed to get to the root of the problem. Check the convoluted tube that was sitting 20cms above the extractors and protecting the wires to the TPS.
Meltdown. The fuel rail sits right above the switch.
Can anybody say "heatsoak"
I decided to make a heatshield. Nothing very special about it but I drilled some holes for the wires to pass through and a bit of pinchweld on the edges to prevent cut hands, hoses, wires etc.
I'll see how it goes. I'll go to the drags next week on Wednesday and see how he runs. Not really the right test but what the hell, I'm on holidays atm!
http://s662.photobucket.com/user/nissan ... t%20shield