Freelanderandy
Member
Can someone tell me if I disconnect this sensor should the engine stop because mine doesn't?
Nodge68
Well-Known Member
No it doesn't stop when the oil pressure switch is disconnected. As far as I know, only some VW and Audi vehicles shut down the engine if oil pressure drops.
Freelanderandy
Member
Thanks for that sorry I wasn't that clear I was talking about the sensor on the low pressure fuel line
Nodge68
Well-Known Member
Ah that makes more sense. If the ECU sees no low pressure fuel signal. It likely substitutes a fixed value, so the engine will continue to run, although at a lower power level.
Freelanderandy
Member
Ok thanks just wanted to make sure
When plugged in get warning light and won’t go above 2500 rpm but when unplugged runs good
GrumpyGel
Well-Known Member
Presumably it must be either the sensor or the fuel lift pump?
Don't know how much the sensors are, but if they are steep, could you not get one from a breakers to see if it makes any difference?
Nodge68
Well-Known Member
Your low pressure pump isn't delivering enough pressure for the EDU, so is limiting power. Unplugging the LP sensor simply forces the EDC into assuming that the LP is acceptable. This is bad as it could damage the HP pump, through lack of fuel. Restoring the LP to correct pressure is a much safer solution.
Do you think getting a new lp sensor will sort it
Nodge68
Well-Known Member
You need to look at the live data before condemning the LP sensor. The LP supply should show more than 350Kpa at full power, preferably 380Kpa +. The sensor is a thousand times more reliable than the LP pump. So if you are getting a MIL under load load, it'll be the filter blocked, or the pump itself.
GrumpyGel
Well-Known Member
You should heed the comment about damaging the HP pump.
Have a read of this thread, it describes similar type symptoms although I doubt it will be the same problem. It does though describe testing methods if you want a backup reading to the LP pressure sensor and its part number...
https://www.landyzone.co.uk/land-rover/td4-fuel-problem-mil-light-comes-on.254530/page-2
