I am a R.G.I and today after power flushing a very old system,i had problems starting the boiler. The boiler tries to fire but does not ignite, it then goes to lock out. It was working when i got their, but cycling on and off due to sludge. I informed the customer that i could smell fuel and that i should be left off untill it is serviced by an oftec engineer.She said it had not been serviced for a while. I did have a slight spillage of water when i diconnected the hose pipes, but not enough i thought to cause faults. After a few lighting attempts the smell got worse so i stoped. is it possible to flood it with oil. Their are no visable signs of oil leaking, all feed backs appreciated