Audi 100 fuel pump relay? Where?!?
 

Hey guys, this is driving me round the twist, I cannot for the life of me find the fuel pump relay in my Dads 100. It looks like someone moved the ones under the dash around the place, but, I actually don't know which relay is the fuel pump relay. Can someone please put me out of my misery and tell me what number it is, and I don't mean the part number, just that big white one on top. And before anyone says to look at the diagram on the kick panel, forget it, it doesn't even mention the relay! :wall::cryin::wierdo:

http://i30.photobucket.com/albums/c3...ps95ed8af5.jpg

Ignore the two relays to the right of the electric windows relay, they're for the headlight dip/dim arm on the steering column...

http://i30.photobucket.com/albums/c3...ps261ca5e4.jpg

:tup:

Seriously guys, no one????? :shake: :(

It's a 1989 100E, 2 litre. I know it's a simple enough thing but I'm bogged down here, come on guys, there's plenty of Type 44 owners here. :nonod:

is the relay not under the hood with the fuses?

it should from my recollection,, the 229 or 275 ,, if no one else helps I should know by tomorrow eve,,,, I gather you have tested the pump

You're wrong, it should be 213 or 215, at least when B3 or C3 has engine that has management powerful enough to be able to turn on the relay - like the RT here.

Relay in question in this case is one with number 263, because it occupies the place where fuel pump relay should be.

According to the cover on the fuse board there's no mention of it,only the fuse itself. There's a brand new pump gone in so the relay was my next port of call for testing.

It is an RT engine alright. So just to clarify MSH is it the 263 the fuel pump relay?

By the way thanks for taking the time to reply guys, it's very much appreciated. My head is melted from it!

Dunno on yours because there was a lot of changes pre/post 1991 but I've got three made in 1991 and on all of them the fuel pump relay is right in the middle of the fusebox under the bonnet, 215, it's got a place to stick a fuse in the top, you can use this to 'jump' the pump and trigger fault codes or output tests I think. If you stick a fuse in it!

That 263 is where the pump relay should be, yes.

Looks like that box is missing the 'Motor/Moteur' ECU fuse holders also so it must not have much of a brain.:crazy: early/original RT.

Thats Roger D for 263:tup:

The fusebox wasn't changed and it was used in the same form also in later B2's, B3's and B4's.

213 and 215 are almost identical, 215 is heavy duty version of 213 with higher rated current, I presume that originally it was intended for engines like NM, 7A and 3B, because there the relay has to pass power to injectors as well [+ something else I've forgotten], unlike KE-jetronic/KE-motronic powered engines, where it only turns on the fuel pump.

Ignition control unit remains the same regardless if it's K-jet or KE-jet.

I know the fusebox wasn't changed, I meant the pump relay.:p

A pic. or a later relay for the OP, from google.

http://i1192.photobucket.com/albums/...psa0abfec1.jpg

I mean the fuel computer, whatever it's called, there are two big ECUs in post 1991 C3 cars, one under each kick panel in the driver and passenger footwells. One does the ignition, one does the fuel, hence the K 'E'

Mine are KE 111, which have some electrical crap controlled by the Fuel ECU I think, differential fuel pressure regulator, lambda feeds into it too I think. All emissions stuff, just more to go wrong.

Did they not fit an antitheft thing in the fuel pump relay on the later type 44s,theres no fuse holder in any of mine.

Yours are early then, that's what I was meaning by jumping the pump in your other thread, easiest way to do it is to stick a fuse in the top of the relay, on mine.:tup:

All that factory alarm could do - don't allow to switch on starter interlock relay, nothing else. And nothing related to fuel pump relay. Fuse holder is for switching engine management into service mode or blinking fault codes. Obviously early C3's had no engine management that smart.

Fuel pump relay is turned on by ignition control unit, so we can forget about fuel injection stuff in this thread. Older engines without electronic ignition use fuel pump relay that has enough logic inside to turn on and keep running fuel pump according to rpm signal.

Hmm! That might explain something then, on the 100 turbo the pump doesn't prime on first ignition. It does nothing until the engine starts. It that being triggered by an rpm signal then? It's an older car than the other two but still has a fekin complicated fuel system under the bonnet.

Correction Ian, you can run the pump via the fuse holder, when doing the solenoid output tests. It doesn't jump the pump! I just remembered running it via that fuse holder. But you don't have one, so it doesn't matter.:D

So hang on, before this thread goes off on a tangent, albeit an interesting one, you guys are saying that the 263 is in the wrong place? This is an early RT engine so it didn't have the fused 215, and if I'm correct wasn't that used for fault diagnosis on the likes of the 200q and other audi's with more complex ECU's as mentioned above? Incidently I had a spare fuse board from a 91 type 44 100 (KV 2.3) with some of the relays still in it and the 213 is in the same spot as the one I pictured, so, what goes where gents???

Think it's in the right place, just broken maybe.:lol:

Sounds like his have the same number on them.

Ah ok, thanks missfire, it's gas cos as long as I've owned and worked on audi's there's always something silly and small that knocks me off. I'll pull that relay tomorrow and see if I have one to swap, and if not I'll bridge it to see if the pump runs free.

Thanks guys! :tup:

Now I'm off to bed, I'm on first feed duty and my little lady is an early riser! :shake: :arf: :tup:

never said I was right! was to find out for sure today but no need now as im sure your right:)

So, finally got around to tackling this today, found another fuel pump relay and tried it... no joy, so I put a bridge in, fuel pump kicked to life... And the old girl fired up on first twist!!!... And then ran out of petrol!!! :lol: Hahaha! But, it doesn't matter cos I'll be up to the BP in the morning with me can in hand, and hopefully a good root around the garage will turn up a working relay. :nod:

Thanks guys, I'd be lost without ye!!! :tup:

Result:tup:

Good result!
 

:tup: