hot start fix

hi lads,i've had a hot start fix from ebayfor about 2 years it worked a treat until couple weeks back when i had problems starting car in the mornings,i changed leak off pipes,glowplugs ,temp sensor,one glow plug goosed which blew amp,changed amp,car starts atret ,but now iam getting the dreaded ho,t start problem again,has anybody any ideas on this ,cheers pat

check yer earth straps

Perhaps your pump is just to worn now ?