should be 5V at PIN 1, PIN 2 should be 0V, and PIN 3 at idle should be approximately 4.3V, and when the low fuel line pressure increases the voltage output should increase from 4.3V to just under 5V
So yours is reading low pressure which we know.
It could be pump low pressure or the sensor not...
Worth a read. This one turned out to be the LP sensor itself.
https://www.electriciansforums.net/threads/land-rover-p1260-fault-code-fix-freelander-td4-bmw-installation.113383/#gsc.tab=0
Before you buy the pump. It is worth unplugging the hp sensor on the end of the fuel rail and the lp sensor which is down near the steering rack behind the battery.
Spray clean the connectors and try one more time
My TD4 has a lp pressure of 390 -425 kpa.
So 275 is very low.
LP fuel pressure is dropping low. 276 is too low. Would.expect 320 minimum.
Not sure what pressure it cuts the HP pump to protect it but LP fuel pump would be my next replacement. Get a good make. PIERBURG if you can get one.
Low pressure fuel readings are low. Would expect 320 as a minimum.
My best idea is either a clogged low-pressure fuel filter or a failing low-pressure pump.
Both items are in right hand side rear wheel arch.
Wait and see if anyone else comments.
It may be worth doing a data recording as you...
But hey, it gave you the drivers side!!
That'll be the wiper linkage has let go with a worn ball housing.
Two options. Buy new rods with ball housing. Or buy fix it clips to hold the old one together.
Either works well and solves problem...
But the gearbox feed isn't changing so the immobiliser ecu won't do either.
Check you have both sides of the gearbox inhibit switch wired OK. Looks like one side is ground and the other to the immobiliser ecu.
You need to check fuel pressure around the time the fault occurs.
Exact is not essential !!
Get low and high-pressure fuel pressure and inlet manifold pressure.