Check this link out: https://www.fixmyoldride.com/Chevro...e7e5cd24ed24635&at_ab=per-2&at_pos=3&at_tot=4
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I found a rental pressure gauge kit with the adapter I need. $160 but I'll get it back when I return it. It's a 27, nearly 28 year old pump and it looks like it's been in there a while.
I have another issue with the truck that I finally found a cause/effect connection. Sometimes the radio doesn't power on. The old radio didn't work but would sometimes power on. When I opened the hood with the release, the radio cut off for a moment when the hood popped up to the safety catch. So I have an electrical issue that may or may not be related. This is a nice basic truck and except for the color (I hate white, it's so bleak) it's what I need.
Factory radio? That could just be a loose connection in the dash or, unfortunately, 100 other places. The sharp jarring from that big ass hood popping up could've shaken the harness just right to make the radio lose power for a second. Next time it's off but should be on, use your fist to bump the radio and to beat the dash around it. Maybe gently but slowly move and pull on the wire harness under the dash.
That fuel pressure is on the low side, I like to see over 16 on these. Many have been over 20. Try a Quantity test. Pump into a bucket at fuel filter for 5 minutes. You need a minimum of 5 gal/hr. Also check your connectors at injectors. Good Gaskets and tight. Wires twisted. If untwisted twist them. I forgot how many turns but I think 7/ft minimum. It makes a difference.