loosing fuel prime while engine is turned off

[Naughty Audi]

I have twin 2000 150 fuel injected engines which recently had their VST filters changed. This past weekend went out and drift fished with engines off. After an hour or so I stared the engines and the port side had no gas the primer bulb was soft so I had my mate pump it until it was hard and then powered up and and kept dieing unless we kept squeezing the bulb. Then once I got up to 3500 RPM's or more there was no need to prime any more and ran fine.
What is causing this?

[boats.net]

Don't know what model engines you have but could be problem with fuel pump, check fuel hoses, filters and clamps.

[Naughty Audi]

I have sx and LX 150txry

[boats.net]

Check diaphrams in low pressure fuel pumps.

[Naughty Audi]

what am I looking for holes in the diaphrams?

[jb123]

Pumping the ball with a bad low pressure pump will dump XS fuel in the crankcase causing it to run rough
Did you see a gas Sheen on the water?

[Naughty Audi]

yes I noticed a gas sheen with the engines off while drift fishing