Figured so. Had a similar issue a while back when I brought a second Limited Edition across Canada. Went over the fuel system with a fine tooth comb, and couldn't relate it back to the dash light. You're right about the pressure regulator, quite robust and will seldom fail. Nothing but a spring and diaphragm using differential pressure to regulate the fuel pressure.I was referring to the electrical part of the fuel system, not the fuel supply system, should have been more clear.
this one?There is a fuel injector manual for the CX500T that is quite good at explaining the CFI system - "Turbocharger/Computerized Fuel Injection Manual". Goes into a lot of detail about the various parts/pieces of the system. Bit different than the '85/'86 CFI system, but the basics are the same. The '85 and '86 FI systems are the third generation of the Honda PGMFI system on its bikes.
I have a Clymer book and someone else sent me a website address for an online manual. Thanks.Do you have the service manuals for this bike. The OEM service manual, Electrical Troubleshooting manual, and the Supplement? Recommended and necessary tools to troubleshoot any issue with your bike.