Are there any air bubbles going back in the return line?

Tandem pump failure?

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Drive it down the road let it cut out, then remove the fuel in pipe on the filter & check to see what the in tank pump is doing, you should have a good flow there.

Done quite a few in tank pumps on seats & VW  

 

I would rather be sailing                                                              

dont no if there is any air bubbles is the return line clear pipe dont remember it being clear,

if the tandam pump was at fault would it not do it all the time and have poor performance,also is the tandam pump the high pressure pump.

thanks mike.

I'd forgotten that Ford fit lift pumps on the Galaxys; what's the engine code?

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you should get 1 bar pressure from the lift pump in the tank, and 5 bar from the high pressure pump on the end of the head. You will see a torqx bolt in the lower left side of the pump, you remove that to fit an adaptor to test the pressure.