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Several times the fuel pump wont prime when switching on ignition.

If engine start is pressed it just tries to wind over. Only will leaving the car off for a few minutes seems to sort it as if it never had a problem.

Anyone come across this or know what/where I could start to look?

Cheers,

yes-change the fuel pump relay under ecu-there are 3 relays 2 large and one smaller-change them all while there[cheap enough]
this is becoming a fairly common problem with these cars
it could possibly be your pump itself but i would do the relays first

arthur.d wrote: ↑

Tue Oct 24, 2017 3:08 pm

change them all while there

Absolutely this^^^

They're a bit of a pain to change out, as the wiper arm needs to be removed, but worth doing them all to save any further hassle.

when removing fit a new scuttle panel-get it from audi-its around £20 freshens up the area
take your time with wiper removal and careful with the screen-use tape where wipers go to aid re-fitting etc

I'm thinking about changing all relays while in there. Has anyone done this recently and have all the part numbers needed?

Looks like this is the fuel pump relay:
4H0 951 253
And I believe two are needed. (??)
I hear the updated are 644 ones:

Original ones are the 614:


Starter relay:
4H0 951 253A (??)

Any other relays I should swap in?
Thanks.

do the little one while you are there too-silly not to-[thats the 373]

644-70 amp relay x2[meyle or similar] to replace the 614-its called a multi function relay around a tenner a throw

373 AUDI VW VAG GROUP 8D0951253A x1-this is around seven quid

arthur.d wrote:do the little one while you are there too-silly not to-[thats the 373]

644-70 amp relay x2[meyle or similar] to replace the 614-its called a multi function relay around a tenner a throw

373 AUDI VW VAG GROUP 8D0951253A x1-this is around seven quid

Thanks I'll order that one too.

RS4eddie wrote: ↑

Tue Oct 24, 2017 9:53 pm

arthur.d wrote:do the little one while you are there too-silly not to-[thats the 373]

644-70 amp relay x2[meyle or similar] to replace the 614-its called a multi function relay around a tenner a throw

373 AUDI VW VAG GROUP 8D0951253A x1-this is around seven quid

Thanks I'll order that one too.

Engine componant relay. I replaced my 614 with 644 and seems to be ok now.
Its the number 2 slot in the relay panel.

glad it sorted your problem out-my audi had this problem for a long while before i bought it
these throw all sorts of codes when left a while- bad earthing codes etc

Not good. This morning had same issue! Pump wouldnt prime. I only replaced one of the x2 614 relays however.

The diagram I was sent from Audi didnt match mine with some of the layout.. may have been for A4?

Does anyone have a link to the RS4 relay diagram?

Vlan One, 3rd post from the end uploaded the ETK stuff for the relays - viewtopic.php?f=35&t=110830&start=15

Well looks like I have encountered the same problem. Went to move the car before going overseas with work & it wouldn't start. No noise from the fuel priming. Never had time to have a proper look before leaving, so have only looked on here.

Seems to be a bit of confusion between relays. Can someone confirm the correct ones and best place to purchase please? Plenty on ebay but you never know what your getting from ebay.

TIA