Ok. So you weren’t kidding on how fast pressure can build. 2 second fuel cycle…….78psi! But in 30 mins it went from 78 to 59psi. One extremely small leak on the inlet to rail. Cannot see any leaks on the rail itself feeding injectors. All other joints are dry.
Repairing the connection, but noticed the return line it still pressurized. So regulator is working properly then?
Fuel line repaired. Did the test again, but with the return plugged in. No visible leaks. In 30 mins time: 37psi to 30psi
Yes! And that was the inlet hose to the rail's quick disconnect. NAPA sells new ones that are properly put together; those nylon lines are supposed to be heated before going over the barb, but if too heated, the nylon fails to shrinky-dink when cooled.
Of course, '86 or newer, as the connection down at the frame rail's the same as the factory CFI, IIRC.
Made a few of those connections. And dealt with the overheating. Think that joint was it. But had enough hose to cut and redo. But added a hose clamp just to be sure. just took around the block. Ran good. Still got gauge on. I’ll give it a few hours and read it. But does the second 30 minute reading look good tho?
Yes, as long as it held 30PSI after that for a while. The pressure reading isn't as important as keeping the measure of fuel inside the lines and rail, so pressure will jump to spec on initial prime.
Overnight update. Gauge zeroed out over night. I turned key to on to let pump cycle, then cranked. It stumbled a bit and fired. Thoughts?
It's still losing pressure, which it will eventually do, but it's either 1) also losing fuel, which causes the 'dead spot,' or 2) you could be cranking the engine upon initial key-turn, when you should wait for the 2 second cycle before cranking, which is what I do.
I did let it do the fuel pump cycle prior to cranking today. I’ve looked at all the connections, and not a one is wet from sitting. I’m hesitant on removing upper intake, but that’s truly the only spot on the fuel system I cannot see clearly.