Fuel Pump Relay

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Fuel Pump Relay

Postby Gurdin » Sun Mar 08, 2009 10:08 pm

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
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Fuel Pump Relay

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Re: Fuel Pump Relay

Postby totaleclipse » Sun Mar 08, 2009 10:25 pm

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.
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Re: Fuel Pump Relay

Postby Gurdin » Sun Mar 08, 2009 10:32 pm

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
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Re: Fuel Pump Relay

Postby totaleclipse » Sun Mar 08, 2009 10:35 pm

lol, misread that there.

not sure where the relay is, sorry.
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Re: Fuel Pump Relay

Postby djp30djp » Mon Mar 09, 2009 6:41 am

Hdi 90 doesn't have one, only the 110.
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Re: Fuel Pump Relay

Postby Gurdin » Mon Mar 09, 2009 9:41 am

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
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Re: Fuel Pump Relay

Postby teamster1975 » Mon Mar 09, 2009 1:24 pm

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.
1996 406 1.8LX Got a bad case of hydro lock!
1996 406 Executive 2.0 Turbo XU10J2TE No longer hangin' on in there :(
1997 Honda CB500V
2002 Volvo V40 1.8 GDi SE Killed by a fire engine reversing into it
2003 Volvo V40 1.8 GDi SE

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Re: Fuel Pump Relay

Postby Doggy » Mon Mar 09, 2009 1:59 pm

djp30djp wrote: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?
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Re: Fuel Pump Relay

Postby Gurdin » Mon Mar 09, 2009 4:32 pm

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
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Re: Fuel Pump Relay

Postby jasper5 » Mon Mar 09, 2009 6:59 pm

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.
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Re: Fuel Pump Relay

Postby mjb » Mon Mar 09, 2009 7:41 pm

jasper5 wrote: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 :lol:
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Re: Fuel Pump Relay

Postby jasper5 » Mon Mar 09, 2009 8:13 pm

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.
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Re: Fuel Pump Relay

Postby Doggy » Mon Mar 09, 2009 8:49 pm

jasper5 wrote: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. :?
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Re: Fuel Pump Relay

Postby jasper5 » Mon Mar 09, 2009 9:17 pm

Very strange :?
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Re: Fuel Pump Relay

Postby djp30djp » Mon Mar 09, 2009 11:21 pm

djp30djp wrote: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.
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