Intermitant fuel pump not priming with ignition

[Rodney007]

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,

[rs user]

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

[Surrey Sam]

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.

[rs user]

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

[RS4eddie]

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.

[rs user]

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

[RS4eddie]

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.

[Rodney007]

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.

[rs user]

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

[Rodney007]

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?

[Surrey Sam]

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

[RS4JAY]

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