2010 xc 90 3.2 code P0087 low fuel rail pressure

raquette · Post by **raquette** » 28 Dec 2018, 20:25

car stumbled and quit a couple times and the started right back up over the last 2,000 miles. it happened today and now sent this code P0087.

today the fuel tank was low and the light just came on, added fuel and car now runs fine for 100 miles since this incident. I am reading threads that show either the fuel pressure regulator, or fuel pump or filter can cause this. fuel filter was replaced 3,000 miles ago.

I'm thinking since this comes and goes to replace the fuel pressure regulator - anyone have a similar experience with the regulator corrected the problem?

Masscomguru · Post by **Masscomguru** » 28 Dec 2018, 21:21

The fuel pressure sensor is common. It’s a relatively cheap part and easy to replace. I would recommend that.

Post by **abscate** » 29 Dec 2018, 10:13

Hello Oneida - from ALB

Check out shockwaves thread on diagnosing fuel problems - he had a kinked hose in the tank that took a real careful diagnostic process to get to.

In short, monitor the fuel pressure at the rail to see if it is fluctuating before you 'throw parts'

The parts aren't cheap, so spend some time working the problem.

The system works by the ECU taking fuel pressure input from the sensor, then sending a waveform to the Pump Electronics module or PEM. The PEM gets prime power from the Central Electronics Module CEM via a built in fuel pump relay.

The PEM sends a signal to the pump to control fuel pressure.

Post by **jimmy57** » 29 Dec 2018, 11:13

The hard part is monitoring fuel pressure on a 3.2 or 3.0 P3 turbo. The fuel pressure test port is an inverted fitting, not the tire valve deal on all the others. IPD has a $60 something dollar solution and there are ones that attach at fuel filter fitting under car like this:
https://www.ebay.com/itm/Universal-Car- ... rk:25:pf:0

The fuel pressure sensor could be changed as mentioned above as it is $40 and that may fix it. The connector at PEM, in the well with spare on tht year model on right, should be checked though those make engine quit when they fail in majority of cases.

There is no fuel pressure regulator, well there is but it is a safety max pressure limiter and serves no purpose for normal operation. It is changed by replacing the whole pump-sending unit assembly. The primary fuel filter is made on the pump. I have not had a vehicle with undecar fuel filter cause an issue on a P2 yet. The function of filter under car is to catch the finest particles, mostly wear bits from electric fuel pump. By far and away the two biggest culprits are FP sensor and PEM connections.

The kinked hose problem is almost ceretainly an issue caused by repalcement of the pump-sending unit assy due to the recall for fuel leak. Is there any reason to believe your fuel pump has ever been replaced?

raquette · Post by **raquette** » 05 Jan 2019, 14:21

ok, I replaced the FPR today with a bosch from fcp, we'll see how that goes.

thanks all!