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Author Subject: Fuel pump priming after shut off
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #1
Don't think this has been covered before? For at least the last couple of years after shutting off my 6 the fuel pump primes for about 3 seconds every 30 seconds for about 5 minutes.... then finally stops. Does this every time it's switched off....

Normally they prime once after being shut off which mine does but it continues doing it for some time on and off.

It's never been an issue but just wondering if anyone else's does it or just mine?

I've previously swapped the multifunction relay thinking that would sort it but it made no difference. Must be down to the ECU?

Baring in mind it's a low boost Version 2 mapped ecu do other low boosts do it?

________________________________________

Black power baby! SUUUUUPERCHARGED Superman
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
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Posted 16th Jun 2016 at 01:21
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mocinim

Seasoned Pro

Location: The Darkside of bedford :)

Registered: 09 Jan 2015

Posts: 2,307

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Post #2
None of mine do just the once then quiet

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WHITE RALLYE - valliant

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https://www.gov.uk/check-mot-history
Posted 16th Jun 2016 at 08:06
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armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

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Post #3
mocinim wrote:
None of mine do just the once then quiet


Yup I've owned loads of 6 and rallye and they all do it once. Mine does it like 10x.

________________________________________

Black power baby! SUUUUUPERCHARGED Superman
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.
Posted 16th Jun 2016 at 08:15
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mocinim

Seasoned Pro

Location: The Darkside of bedford :)

Registered: 09 Jan 2015

Posts: 2,307

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Post #4
Got to be a dodgy relay or like said the ecu

________________________________________

BLACK RALLYE - phoenix
WHITE RALLYE - valliant

http://public.servicebox.peugeot.com/

https://www.gov.uk/check-mot-history
Posted 16th Jun 2016 at 09:02
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Robdog Rallye

Junior User

Location: Devizes

Registered: 03 Dec 2014

Posts: 55

Status: Offline
Post #5
My low boost does exactly the same and I've also swapped out the fuel pump/ignition relay which didn't change anything either, I'm also using the 2nd revision ecu.

________________________________________

Low boost Rallye
RB182 Cup
Posted 16th Jun 2016 at 09:07
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luke306rallye

Regular

Location: Rotherham

Registered: 13 Sep 2010

Posts: 310

Status: Offline
Post #6
Mine used to do this when it was standard. Would set my Toad alarm off all the time.
Posted 17th Jun 2016 at 07:46
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6waysforward

Seasoned Pro

Location: Benfleet essex

Registered: 30 Oct 2005

Posts: 3,168

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Post #7
Mine does it every 60 secs for 5 mins after turn off. Makes it worse as i have a bosch 044 under the boot floor which makes a racket.

My lowboost did it to with revision 2.

________________________________________

***Breaking*** Ph3 Silver GTI 6 High Boost Superman




Posted 17th Jun 2016 at 09:32
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Joka-cro

Newbie

Location: Varazdin

Registered: 07 Oct 2013

Posts: 32

Status: Offline
Post #8
Did someone sorted out that problem ?
Posted 7th Jun 2026 at 20:12
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pug_306

Seasoned Pro

Location: Great Hockham

Registered: 28 May 2013

Posts: 1,597

Status: Offline
Post #9
Joka-cro wrote:
Did someone sorted out that problem ?


They do that with an unlocked ECU

________________________________________

1998 Supercharged White Rallye
1992 205 GTi6
205 Turbo 340bhp
Posted 10th Jun 2026 at 09:09
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jimmyhackers

Seasoned Pro

Location: birmingham

Registered: 14 Jun 2011

Posts: 1,290

Status: Offline
Post #10
i think its a phase 2 and a halfish and onwards thing...
im pretty sure peugeot fitted what was to hand with certain parts....i.e. using leftover/older stock etc.

my phase 1 gti6 never did it.
my phase 1 1.4 xl never did it
my phase 2 gti6 didnt do it.

i currently have a 99/2000 XSI that does do it
and a 97/98 gti6 that does it also.

again, pretty sure this is not an issue.....and more likely a stop gap fix from peugeot for other fueling problems the 306 suffered from.

it is to keep the fuel lines full and primed at all times, as well as the tank swirl pot full....

i imagine this is to prevent them emptying and drying out over time. reducing fuel residue build-up on key components like the fuel pressure regulator.

example of what might happen if it doesn't happen:

my current gti6 had been sitting for 10ish years in a scrap yard,
the non e10 compatible fuel lines on the fuel rail had corroded internally.
im thinking this had blocked/stuck shut the non return valve on the return fuel line to the swirl pot.
meaning my return fuel line was essentially blocked (and bone dry)....

resulting in maximum fuel pressure delivered to my injectors....(bad)
my fuel pump running at max pressure constantly and no fuel circulation so it got hot, eventually killing the fuel pump (bad)

unblocking the return fuel line fixed a lot of other random issues i was having.

so the fuel pump priming randomly isnt reallllly a problem, more a quirk.

only downside is it could drain your battery if you leave the car sat for an extended period of time.

________________________________________

the world is changed by people in sheds
Posted 13th Jun 2026 at 10:12
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