THank you all for your advice, I visited the boat today and took the injectors out and did a compression test, I got 200 ibs foot and 220 ibs foot so happy with them. I set up to do a fuel flow test and found the throttle linkage solid, by disconnting one at a time the problem was that the fuel pumps were solid, I feed them off with WD 40 and worked the springs up and down till loose, all good so far. I balanced the fuel quantity but found the diesel that came out the injectors was as white as milk, the spray pattern was not that good either. I checked all lines from the fuel filter to the pumps and the fuel looked clear. When I undid the fuel line from pump to the injector fuel was white, this was the same both with both pumps. I am putting 2 and 2 together and linking water contamination plus initially sized pumps equals contaminated fuel. My manual recommends sending the fuel pumps to a specialist, can anyone point me in the right direction