I need some help to indenity the problem, I am having the same problem with an old JCB, All new filters and all the fuel lines free, plenty of fuel in the pump but no fuel at injectors. Any ideas as to a solution? Also does anyone know how to increase the fuel on the pump?

jim, May 2008

how can i raper fuel pump c531 jcb

musa, February 2011

hi
i had some problems with the fuel to the pump
in the end a located a very small filter at the end of the injector pump by undoing 4 bolts at the end
i cleaned the filter and have had no problems since

nigel, March 2010

The stop lever can jam internally, it is not directly coupled so pushing the external stop lever back home doesn't necessarily push the internal stop home. I have fixed this by taking the top off of the pump and waggling the stop to try to free it. There is a long thin spring to return the internal stop, this spring seemed weak, so I added more tension by adding a copper spacer - you will know what I mean if you look inside it yourself.

Henry, January 2010

water in your fuel will cause corrosion on the pump govenor weights.

daz, July 2008

Hi Jim, I have just seen the results of a pump failure which sounds like yours, the pump has been dismantled to inspect it and there is a "Tar like sticky substance on the working parts. It has been diagnosed as having been run with "contaminated fuel" The chap who's problem this is, has a CAV diesel fuel pump from a marine engine Which has been running Red diesel. Try to check if there is the slightest of deposits in the tank or pipework rub it between your fingers and see if this goes slightly sticky. If so when it run's through the pump it gets thicker over time and ruins the pumps pistons. My mate ran his engine perfectly without a missed beat, shut the egine down and it refused to even attempt to start.

Dave, June 2008

locate fuel cut of solenoid looks like oil pressure switch with 1 elecrical wire on spade or small nut connection,remove solenoid carefully invert take out plunger and spring replace solenoid into injector pump and start if does then solenoid faultyif does start it will not stop on key u will have to stall it

caine, May 2008