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Author Subject: Fuel pump query
orta

Senior User

Location: East Mids

Registered: 02 Sep 2006

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Post #1
hi all,

So the rallye wouldn't start last week. Battery is good as its turn and turn and turn but not fire. Then I realised the fuel pump was priming with ignition. Bought second hand pump off eBay and fitted. Pump now primes fine and I've tried priming it three times before trying to actually turn the engine on, but the engine should won't come on?

So what do i check next?

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Posted 20th Sep 2015 at 14:24
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prism7guy

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Registered: 13 Jan 2008

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Post #2
The relay behind the battery would probably be my advice to check.

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Posted 20th Sep 2015 at 14:59
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orta

Senior User

Location: East Mids

Registered: 02 Sep 2006

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Post #3
Thought the relay could only be an issue if it wasn't priming? And it's priming just fine

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Posted 20th Sep 2015 at 15:00
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #4
check for spark.

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Posted 20th Sep 2015 at 15:10
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orta

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Location: East Mids

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Post #5
Spark from what?

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Posted 20th Sep 2015 at 15:18
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dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

Posts: 10,305

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Post #6
The spark plugs.

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    • Posted 20th Sep 2015 at 15:24
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

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    Post #7
    fml

    Doh

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    Posted 20th Sep 2015 at 15:27
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    orta

    Senior User

    Location: East Mids

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    Post #8
    Doi!! I'll check those in sec.

    Does it mean anything that with the relay bypass in place the engine warning light is not on, yet with the relay in place its on?

    I've done the relay checks as per the faq I think it checks out ok?

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    Posted 20th Sep 2015 at 15:49
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    orta

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    Post #9
    Also can't check the spark plugs as I have no tools that'll reach into that deep hole to unscrew them and bring them out

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    Posted 20th Sep 2015 at 16:00
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    RetroPug

    Seasoned Pro

    Location: Leicestershire

    Registered: 15 Jan 2013

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    Post #10
    I don't know what your issue is but I strongly recommend investing in the correctly sizedspark plug socket. Should only be a few pounds and will allow you to a. check for spark now and b. change your spark plugs in the future

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    Posted 20th Sep 2015 at 18:15
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    orta

    Senior User

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    Post #11
    You get one from halfords?

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    Posted 20th Sep 2015 at 19:24
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #12
    I'd suggest getting one of the Halfords toolkits that are nearly always on offer, not much more you'll need on a 306 other than a 35mm socket and a multimeter.

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    Posted 20th Sep 2015 at 19:35
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    Cjwatson27

    Seasoned Pro

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    Post #13
    And a angle grinder

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    Posted 20th Sep 2015 at 21:14
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    stan_306gti6 Forum Admin

    Location: Kent

    Registered: 18 Jan 2004

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    Post #14
    As said, check for spark. If no spark - suspect crank sensor.

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    Posted 20th Sep 2015 at 23:35
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    orta

    Senior User

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    Post #15
    So removed one of the spark plugs today, and placing it on the back of the engine (that's how far the wires would reach) and turned the car over... No spark.

    Am I testing them right? It just seems weird that first my fuel pump wasn't priming, so I change it and then there's something unrelated wrong as well?

    Would changing the spark plugs help? As this testing of the crank sensor from the faq looks beyond me

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    Posted 23rd Sep 2015 at 12:45
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    edhunter

    Regular

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    Post #16
    Did you check the shock sensor that cuts off the fuel? Looks like red button inside the engine bay close to the ecu boxSmile
    Posted 23rd Sep 2015 at 15:05
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    demondriverdan

    Seasoned Pro

    Location: Londinium

    Registered: 29 Nov 2010

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    Post #17
    edhunter wrote:
    Did you check the shock sensor that cuts off the fuel? Looks like red button inside the engine bay close to the ecu boxSmile


    It shouldn't prime when the inertia switch has triggered but worth checking anyway. Just press the red button behind the ECU and make sure you don't feel it switch / move. If it does move then it had triggered.

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    Posted 23rd Sep 2015 at 18:23
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    cully

    Seasoned Pro

    Location: Cullompton

    Registered: 12 Jun 2013

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    Post #18
    coilpacks need earthing for them to work
    if you have unbolted one and reasted it on the head i suspect its lost its earthpath through the bolts Wink
    Posted 23rd Sep 2015 at 19:18
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #19
    no they dont.

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    Posted 23rd Sep 2015 at 19:24
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    RallyeP6

    Regular

    Location: West Byfleet

    Registered: 11 Jul 2013

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    Post #20
    Coil pack doesn't earthing they are insulated, but push the spark plug back into the coil pack and have the threaded part of the spark plug resting on the cam cover somewhere. Turn the engine over and watch for a spark from the anode.
    You will need a multimeter to do the checks on the crank sensor as above.
    Posted 23rd Sep 2015 at 22:15
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    orta

    Senior User

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    Post #21
    Where is the crank sensor located anyone?

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    Posted 25th Sep 2015 at 08:27
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    pug_306

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    Post #22
    Below thermostat housing. Bolted to the gearbox with a 10mm bolt.

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    Posted 25th Sep 2015 at 08:29
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    orta

    Senior User

    Location: East Mids

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    Post #23
    Pics?

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    Posted 25th Sep 2015 at 08:32
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    rikky 🦔

    Location: cheshire

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    Post #24
    it's just next to the gearbox mount on the top, black plastic plug with a brown connector

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    Posted 25th Sep 2015 at 09:16
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    orta

    Senior User

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    Post #25
    Is this it?

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    Posted 25th Sep 2015 at 09:27
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