I have noticed my diesel caddy with MF motor starts to loose power and leak fuel off the rear bracket at the bottom and back of injection pump after it runs for a bit or warms up. I cannot see where it is leaking from but I am guessing its the fuel distributor head O ring - my question is if just a leaky distributor head O ring would cause reduced power as it warms up or would it more likely be due to worn pump tolerances that once warmed up become greater thus allowing for less power than when first running?