Fuel Pump Relay

[Gurdin]

Can anybody elt me know where i will find the fuel pump relay on a 2000 (V reg) 406 Hdi 90.

i might need to change it as i'm having a few problems and dispite reading the haynes manual and the owners manual i'm still unsure of where it is.

thanks

stu

[totaleclipse]

low pressure will be in the fuel tank, the injection pump is a square thing, in front of the head, on the drivers side.

if in doubt, follow the fuel lines.

[Gurdin]

thanks for the reply, its the low preasure fuel pump relay i need to locate.

i need to get one tomorrow and want to take the old one with me to make sure i get the right one.

stu

[totaleclipse]

lol, misread that there.

not sure where the relay is, sorry.

[djp30djp]

Hdi 90 doesn't have one, only the 110.

[Gurdin]

Thanks djp30djp, that will probrobally explain why i couldnt find one!!

Does that therefore mean that the only thing that can be wrong with it is that the pump has died?

This based on the fact that the car will turn over but not start and that i can not hear the pump running at all when i switch on the ignition.

Thanks

Stu

[teamster1975]

There have been lots of LP pump failures on the Hdi's Gurdin, seems to be a common fault.
Have a read of this thread for starters.

[Doggy]

Hdi 90 doesn't have one, only the 110.

I was trying to make sense of this too - according to Haynes, both DW10 & DW12's have a dual 'engine management relay', one half of which controls the LP pump. On the Xsara, this was the usual double-relay bolted to the inner wing, but I couldn't find it on the 406.

Anybody know for sure?

[Gurdin]

I have been getting conflicting opinions on this one as i have phoned around. Some say no relay others split relay, fuel pump and others sensors....

The long and the short of it is that the most common fault is the pump, i read another thread that made me think "mine was doing that" when the writer said that they had noticed poor performance in the lead up to there pump going as the pump needs to keep the high pressure side of the system fed, and yes i did think the other day that the car didn't feel right on the motorway. just glad it gave up on the company car park and not on the motorway or out in the sticks.

I have now lost my time slot to do it myself as the rest of this week is very busy so i have had it towed off to be repaired........... managed to keep a hire van on site so at least i'm not stranded.

i will update the post to let people know what the outcome is.

thanks to all who have given me some invaluable advice.

cheers

Stu

[jasper5]

I looked on Autodata for this relay, the wiring diagram shows a relay module in a block, it shows a wire running from the low pressure pump to the relay module,through a fuse.This relay module has connections from the Engine Control Module, through the fuel pressure control solenoid to the relay module, the EGR solenoid is wired through it as well as the inertia fuel shut off.

The relay module (according to Autodata) is the smaller of the two modules on the drivers side inner wing in the large plastic box in front of the engine mounting, next to the washer bottle and coolant filler tank.The larger one is the glow plug module.

[mjb]

The relay module (according to Autodata) is the smaller of the two modules on the drivers side inner wing in the large plastic box in front of the engine mounting, next to the washer bottle and coolant filler tank.The larger one is the glow plug module.

Do you mean under the wheelarch liner, because i think you've just described the ECU box

[jasper5]

i understand what you mean, I just looked at my car, it's the large box with a lid inside the engine compartment on the left with the bonnet open, looking towards the windscreen.Take off the lid and inside is the ECU on my car, but i've seen two units inside there on other models.

Autodata doesn't show it very well, but if you look at the wiring diagram, it shows it clearly.

[Doggy]

i understand what you mean, I just looked at my car, it's the large box with a lid inside the engine compartment on the left with the bonnet open, looking towards the windscreen.Take off the lid and inside is the ECU on my car, but i've seen two units inside there on other models.

Autodata doesn't show it very well, but if you look at the wiring diagram, it shows it clearly.

I looked at mine last night. On the driver's side there was only the ecu under the big cover, didn't notice anything else in that area, (or on the other side either), hence my question. I agree the wiring diagram clearly shows it, one half for LP pump, t'other for EGR turbo boost valve etc.

[jasper5]

Very strange

[djp30djp]

Hdi 90 doesn't have one, only the 110.

I have both 90 & 110's & I cannot hear any pump sound on the 90, but it works just fine.