Fuel pump cavitation.. at a loss

[Oiyou]

Evening All, long time lurker here but now at a loss.

Since re-installing my fuel tank I've had an intermittent fuel problem which is rendering the car undriveable.

The pump will go from wirring away quietly to making a noise like a dentist drill and the engine dies. Sit for a few minutes and you can drive another couple of miles and repeat.

The (Bosch) pump is new, tank to pump hose is new, the tank has recently been out and I replaced the internal filter with an external one before the fuel pump. Checked that and it's clean. Oh and the fuel tank is confirmed full.

The pump always has power, but will suddenly go from quiet too sounding like its running dry.

Thoughts anyone? I'm at total loss now!

[Oiyou]

Wouldn't credit the tank seal that much but will give it a try!

Cheers

[Oiyou]

Thanks both!
Going to give the vent a try tomorrow. If that fails I'll take the element out of filter and see if that improves matters.

I like the mini accumulator idea, I'll be keen to hear how that goes. I did have thoughts of fitting a lift pump and header fuel tank in the boot, which is a more complicated way of doing the same thing.

[Oiyou]

I'll have a look at the routing, tried fuel cap off and filter removed this morning to no avail.

It is very like the pump is mounted too high. Some days it'll drive for half an hour fine. Then the rest of the time 2 minutes is all you'll get.

[Oiyou]

It's in its original position, I'm beginning to suspect something in the tank that's at liberty to block at the aperture.

It will run perfectly at idle for hours but will cavitate again when I turn around on the sloped yard.

Oh well, tank out time again!