1990 Chevy Truck fuel delivery

Hello, I'd use a gage and check fuel pressure. Sometimes it is easier for me to tee in right there at the fuel filter, in place of the fuel filter. If it is easier under the hood, do it there. I'm an old man I get tired quick trying to stay squatted under the hood.

I guess you can unplug the supply line at both ends, see if you blow air throw it?

Hi, I can't judge fuel pressure by looking at it. I've seen injector spray patterns that looked good to me, but, after using a pressure gage, the pressure was half of what it should have been.

Maybe the supply line is clogged? The autostore may sell the fuel line in straight lengths, you may need a tubing bender. Be careful taking the old line off, you may need it for a pattern.