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I agree with @fjh, check fuel pressure and diaphragm.

I had one similar, came on quick, and got worse quick. changing fuel filters helped a bit but not enough. I my case it turned out the suction line was leaking air into it but not fuel out. Would show in fuel pressure reading or a sight glass placed in the fuel line near the pump. Just one of a few things that could be bad. In my case, not obvious to find but easy to fix.

Fuel pressure, esp under load where the problem is happening, would help to narrow it down. A hand pump on the smoke limit device would be a good way to check if it is holding pressure or leaking right through. 

1 hour ago, h67st said:

+1 on Geoff Weeks' comments. Fuel pressure will definitely cause this, could be a line like has been mentioned or could be the overflow valve (return tee on the top of the pump, if it's worn you won't get enough pressure).

My bet is the diaphragm!

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