Have you removed and inspected the tank sump? Have you tested fuel pressure? A rusted or breaking sump could cause air to be sucked in uphill. A worn pump arm or loose /worn pump eccentric could be affecting pump performance. I'd start with an inspection of the fuel system and then check pump pressure and volume.
It appears to have new gas tank and hard lines . The pump looks to be new . I will start at the pump and rubber lines . Fuel filter ? Thanks for your reply
Yeah, a possibility. Cheap to replace, and should be done every 5000 miles. IIRC, the fuel flow test is pumping gas into a quart glass jar at 1 pint per 30 seconds of cranking? If I'm wrong, can anyone provide the correct amount of time to crank the engine? And, of course, do the cranking with the ignition off or the coil wire shorted to ground.
I discovered my hard lines are rusted thru from the fuel pump to the carb . The tank line may be bad too . Bad news is nobody reproduces the tank line for the sedan delivery . Have to be custom made. I have worked with steel lines in the past. May get some stock line and give a shot at making lines myself. Any suggestions ?
A decent large tubing bender, a decent bubble flare tool, and pull the old line so that you can lay the line stock next to the old line to make your bends.
I've made a few brake lines, and one fuel line repair piece, but my boss and I discussed doing a full-length line. This was in a '55 Pontiac.
You can buy this stuff in rolls or straight sections, Napa and I believe Oreilles etc. sell it also. You can bend it by hand and almost will not kink. =https://www.delcity.net/store/PVF-Brake-Lines/p_820239.h_820240 I made some brake lines for my wagon at the master cylinder by just wrapping it around a socket to get the bends I wanted.
I'm only 52, but I'm 6'6" and 450 or so pounds. Two pairs of decent jack stands to get the car fully off the ground, and a piece of clean cardboard to slide on, oh, and a dining room chair to help you get down to the floor then back up helps immensely.
