Evening all, been a while since I posted because most thing have benn going OK and that is even with LPG conversion

On my Disco 2 2002 V8 the yellow engine warning light has been on for a while. I reckon it has got to do with the sai pump or things related. The pump works when I took it out and tested but will not work when connected even when temp is low as well when coolant has been left to get cold on a frosty evening. Have looked in the engine are fuse box and all fuses and relays look OK when removed. Cannot find dedicated relay for sai pump or is there none?
Any ideas on what I could reasonably do not been the most able person taking bits off th engine to check,

Thanks