P38 2.5 engine

Hi, new to the forum and I hope I am posting in the right place.
It is a range rover related issue, I have a range rover p38 engine 2.5 diesel ( BMW M51) fitted recently in my boat and to get get rid of all the ECU and the wires I managed to get a mechanical pump out of old BMW M21, modified it and I fitted it today, also changed injector number 4 with a standard injection.
I tried to start the engine up it turns alright, diesel getting to injector but not as much pressure doesn't matter how much I am turning the engine it just wouldn't start.

The guy that was helping me today he is a p38 owner and he believes it could be that the pressure pump that prime diesel to the injection pump not very strong with low flow rate as the one I use it says 125 LPH could that be the issue? Do I need more flow pump to feed a lot of diesel to the mechanical injection pump?

Thanks in advance

Welcome

I would say WOW is this not another boat Fred in disguise .(sorry you won’t know the forum joke)

but I won’t, arhhhh I just did

Anyway sorry I know nothing about the engine but help will be on it’s way soon, I know a few members were talking about the mechanically pump so help is around.

good luck

J

M51 in a b**t
@Turboman

Pump in the P38 needs to supply minimum 180mils of fuel in 10 seconds. Any less the pump needs changing as per Wammers advice.
Glows good?

Glow plugs tested and they are fine, what I am worried from the amount of diesel that get to the injector are they suppose to be very strong pressure to push down inside the injectors, sorry I am novice with that.

Should run even if the lift pump is not good, they will run in the P38 with a dead lift pump if the tank is half full or more.
I'd be inclined to give it a dose of easy start and see if it fires.
I can't think of an engine I'd be less inclined to have in a boat, what have you done about cooling? Are you using a heat exchanger or direct cooling. If direct and anywhere near salt water, don't expect the engine to last long.

There was a bloke on here who had the mechanical pump fitted. Cannot remember his name now but I am not good on names.

Bloody Hell theyre bad enough sometimes in the P38 but in a boat!...