Bobby b

Hi There is no issue with the stop mechanism as mentioned a heavy duty spring is holding it in the run position all the time, so the solenoid only momentarily pull it to stop for 5 seconds then realise to run position

See photo during build up with throttle cable disconnected

Hi I can confirm the stop mechanism works correctly, it has a external solenoid connected to the stop leaver which is energised to stop position and spring load to closed.

Hi well noted you are correct in thinking the spill rail pipe does (did) loop up in the air and that has now been removed as we thought the same that this could cause a vapour/air lock of some kind. See photo below, just before the rail is refitted, thanks again for all the comments it does seem to point to another pump

Thank you all so much for quick feed back, i can confirm a few of the comments It had new geared type start motor fitted at the time of rebuild and spins over fast (quick enough to put the oil pressure light out) It is 28ft 1950s river boat and cruises around 1800 -2000 RPM valve clearance were one of 1st thinks we checked and were within limits and of course were done when the head came off none return valve (NRV) was checked for correct operation once it starts in in tick over at 700/800 RPM fine It is under a deck which does get warm with qty 2 - 4 inch air vent (as said it ran for 100 hours with no issues) with same vents does not matter what position the throttle is in - will not start we did suspect a build up of pressure in pump body but releasing the top banjo bolt on filter housing fuel comes out under a little pressure but makes no difference to starting Fuel system has been bleed many many times I do deep down think we have fitted another duff pump and as one of one mentioned not making enough pressure to open the injectors with hot fuel , thanks again for all your comments

Good evening New to the forum and after some advise on an on going problem I have we BMC 1500 - a brief history Brought a boat as a restoration project with a BMC 1500 and as matter of course sent for overhaul to local engine company, turned out to be in good order, an overhaled injection pump was fitted also as a matter of course, this engine than ran for about 100 hours in 2021 faultless but towards the end of the season it would not start when the engine was hot, if you left in 20 mins to cool down it would start fine, since then the following work has been done on the engine. compression check all around 400psi when hot or cold Head removed and inspected [by the company that overhaled the engine] no damage noted lift pump replaced injector pump replaced [another overhaled one] injectors checked for correct opening and spray pattern new combustor washers fitted fuel filter replaced and water trap cleaned NRV on fuel filter injector pump return line check for correct operation calibrated hole in the banjo bolt on the top of fuel filter checked Thought it was all fixed until out on the water yesterday and same problem ! Engine is turned by a new battery and starter motor which turns fast enough (in my option) Temp gauge shows 80 deg which L would say is roughly right, measuring with a infa red gun, cylinder head is around 85 deg, injector pump is about 65deg. This engine is not fitted with an oil cooler like some I have seen - does it need one? The thinking is the fuel is too hot and the injector pump can not make the pressure to open the injectors when been turned by the starter motor - possible ? it has a 75 deg thermostat fitted - if this is removed the engine runs a lot cooler and starts - (not the answer) would like to get to route cause of this issue and would like your options please. Photo for reference Thank you Bob