Thread: Fuel Pressure Challenge 2010 D4 2.7

Originally Posted by BradC

That’s why I drove around with a fuel pressure gauge cable tied to the drivers side wiper arm. Not pretty, but absolutely definitive.

Originally Posted by Tins

Good thing you don't live in Melbourne.

Tru dat, can't see the gauge with the rain, but also can't see the gauge with the wipers on as it's going too fast.

Originally Posted by Tins

Good thing you don't live in Melbourne.

I did June to Dec in Melb back in 2020. Nice place, but if I wanted that sort of weather I'd move to Scotland. Same weather but better Scotch and a better availability of Disco parts.

Originally Posted by Graeme

A similar low pressure fault but also an excessive pressure fault can occur with the 4.4TDV8 in the L322, L494 and L405 which is caused by a poor contact in a connector in the circuit to the pressure sensor. Your sensor wiring might need to be checked back to the PCM but start with a critical check of the connector at the sensor.

Shake the wiring with it running and see if that causes it. Can be useful to log gap while doing that

Originally Posted by BradC

I did June to Dec in Melb back in 2020. Nice place, but if I wanted that sort of weather I'd move to Scotland. Same weather but better Scotch and a better availability of Disco parts.

Now now, Edindurgh is further north than Moscow, and most of Scotland is further north than that. Melbourne never gets that cold... For a given definition of never.

Can't argue about the Scotch though.

Originally Posted by Tins

Now now, Edindurgh is further north than Moscow, and most of Scotland is further north than that. Melbourne never gets that cold... For a given definition of never.

Can't argue about the Scotch though.

Scotland is warmed by the Gulf Stream otherwise it'd be 10-15 degrees colder.

How the ocean current that keeps Scotland warm could collapse – Dr Richard Dixon | The Scotsman

This is not really a criticism at what has been done or the mechanic...

Unfortunately once one starts shooting both barrels of the parts cannon you get so far off the original fault with potentially more variables then when you started.

This bit is a criticism...
*what? 6 injectors? changed because? .... thats more injectors on a 3.0 than I have ever changed in my life.
*the low pressure pump should be round 8 psi ? is it?
*the pressure sensor on the rail can be purchased separately, yes its a bit of a **** around to get the correct one, but cheaper than a complete rail.
*and a HPFP ....
*So after all these parts have been changed it still faults, zero progress then, except as already mentioned your mechanic has added a whole lot of potential variables.

items already mentioned by others...
*A blockage or more likely a kink or squashed line on EITHER the feed line or return line.
*potentially a electrical fault, i'd be pulling the battery out and going through all the plugs.
*Is the HPFP actually the correct one? sooooo the reason why I bring that up is, the OEM one really isnt that expensive and I cant image what? a Ford or otherwise is going to be that much cheaper. I supplied one to another workshop a few months ago. Only to go out to their workshop and find the fault was one of the plugs on the HPFP, again I'd be checking these plugs.

Sitting here, I have nothing clever to add
its a fuel supply or electrical continuity issue (which by the way would have been the start point)

P.S unbolt the fuse box next to the battery, look underneath it for any faulty plugs, wires, melty bits.

Originally Posted by DazzaTD5

once one starts shooting both barrels of the parts cannon

There is a DOUBLE BARREL parts cannon?

I'm a bit shook up at this revelation!

Surely a single barrel is problematic enough by itself.

Originally Posted by shack

There is a DOUBLE BARREL parts cannon?

With sufficient duct tape and cable ties, anything is possible. Recoil be damned.