I installed a used IP on my car yesterday and replaced the three hard, somewhat transparent fuel lines.

I got the lines from a local car parts place and they aren't as tight as the originals.

The one that travels from the center of the canister fuel filter with the arrow pointing out down to the driver's side of the IP is not filling up with fuel.

If I crack the line at the filter and then crank the engine the line will fill up halfway or so with fuel. Then I close the line, crank again and the IP drains the line and again the line is empty.

I think this may be causing poor fuel delivery because fuel is barely flowing out of the delivery valves. Not "squirting" as I have read here on a few threads.

However, I do have fuel flowing back through the return line.

I currently have a glass jar underhood to feed the IP and catch the return, I cut the tank out of the loop.

I know you're going to tell me to get the correct lines on there and I will, just wondering if this is most likely what is causing the poor flow of fuel from the IP.

__________________
1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?