Pump not priming

[kennybgr8]

Hi guys bad timing as the car is on market but my fuel pump not priming, its not that old any hint/clues,,,


thanks

[chimp427]

A quick search of the forum should answer this for you as its been asked a million times!
It could be the alarm, fuse or a relay.

[nawarne]

chimp427 said:

A quick search of the forum should answer this for you as its been asked a million times!
It could be the alarm, fuse or a relay.

^^^ In terms of "alarm", read immobiliser.

Likewise - from forums - should direct you to putting test lamp or multi-meter on pump terminals....to determine if fuel pump is getting current.
If not then you've got to work back in a logical sequence.

- Check fuse.
- Get Bosch relays on 'flying' leads attached to loom bundle above battery and feel them as you turn ign. key. You should feel them both 'click' as they make contact.
- If fuse OK and relays seem OK, then use a length of fairly heavy gauge wire direct from battery +ve to pump +ve....pump should spin up then....This would lead me to suspect the micro relay in the immobiliser sticking.

If this is so - you need to have immobiliser set-up checked/renewed.

Nick

[kennybgr8]

Many thanks Nick I will try all the above this morning,,,

[gary58]

I have had the same problem it is the immobiliser at fault but to get you out of trouble for now is to make a way clear then put into first gear then turn over it should start after a couple of turns 🌝

[kennybgr8]

Ah ok I will try that, I had this problem before replacing the pump and was told then try tapping the pump with a hammer and that worked then but not now, the immobilizer certainly is a headache is there no way of simply overriding it as its always in the garage so no real threat of being stolen, and when I have it out and parked I turn the switch at the battery to disconnect the battery and take it with me, that makes the car dead,,, many thanks again for the positive help,,,

Kenny

[Tyre Tread]

gary58 said:

I have had the same problem it is the immobiliser at fault but to get you out of trouble for now is to make a way clear then put into first gear then turn over it should start after a couple of turns ??

So you're saying that starting it in gear will bypass the immobiliser?

Can't see how.

[kennybgr8]

Here is a simple one is the immobilizer under the centre console cant find it it the Heath bible,,,

[Andav469]

I've just experienced this exact problem, I wasn't convinced it was the immobiliser as the relays in the footwell could clearly be heard activating, I then took a direct feed from the battery to the pump and confirmed the pump at fault.
A new pump purchased and all is good again

[blitzracing]

Listen to the relays on the passenger footwell when you turn on the ignition- if the ECU side of things is working you should hear a click as you turn on the ignition as two relays close (dont start) then about 2-3 seconds later you should hear another click as the fuel pump relay drops out as the engine is not running. This will indicate the fuel pump relay is being energised at least. I dont know where the imobiliser interrupts the fuel pump supply- but it would make sense for it to be between the fuel pump relay and the pump connection.

[kennybgr8]

Thanks have done and no sound or feeling that the pump is being energized, all the fuses are ok or to be so nowt blown I I guess its a relay or the pump,,,

[J400GED]

Andav469 said:

I've just experienced this exact problem, I wasn't convinced it was the immobiliser as the relays in the footwell could clearly be heard activating, I then took a direct feed from the battery to the pump and confirmed the pump at fault.
A new pump purchased and all is good again

This is what you should try next. Direct feed to pump, if it doesn't run then it is biffed.

[N7GTX]

If you don't have a multi meter or voltmeter then use a type 501 sidelight bulb.

https://www.google.co.uk/webhp?sourceid=chrome-ins...

It is capless so you can see the wires. Unravel them and pull the 2 leads off the fuel pump. Insert the wires into the leads and then have someone switch the ignition on. If the relays and immobiliser are good then the bulb will light up for 2 or 3 seconds. If it does not light up then suspect one of the two relays above the battery behind the 'glove box' which hang on a short piece of wiring loom.

https://www.google.co.uk/search?q=fuel+pump+relay+...

http://www.powersperformance.co.uk/store/slug/igni...

The relay is also available at euro car parts and similar outlets: Bosch part no. 0 332 014 112

https://www.google.co.uk/search?q=bosch+0332014112...

Edited by N7GTX on Wednesday 24th February 13:31

Edited by N7GTX on Wednesday 24th February 13:33

[kennybgr8]

Ok the pump is working after i hot wired it, what relay am i looking for, all the fuses are ok,,,,,,,

[FoxTVR430]

Hi Kenny, I have also this problem of late. I bought new relays (brown ones) and swapped them over. the car started straight away. So out of curiosity I put back the original relays and guess what it started again!! Bad contact I guess.
So I would unplug the relays see photo (silver ones with red stripe across them) and plug them back in.
Cheapest solution if that works.

Original Silver relays



New Brown relays

[kennybgr8]

Many thanks I will try and replace tomorrow ,,,

[kennybgr8]

Tha saga continues tried unplugging the said relays cleaning the terminals and still nothing, certainly at my wits end now lol,,,

[nawarne]

kennybgr8 said:

Tha saga continues tried unplugging the said relays cleaning the terminals and still nothing, certainly at my wits end now lol,,,

....BUT, the relays do fail! Don't know what they cost now, but for £25-30, you can buy 2, replace your suspect jobbies and see if that sorts the problem.

I'd suggest that feeding the pump straight off the battery would infer the relays have failed. I assume when you hot-wired the pump you stared car...and it was OK?

I ask because it is possible the immobiliser is playing up. The immobiliser cuts electrical supply to the pump AND the starter motor...meaning if, after hot wiring pump, engine turned over on key, then the immob'r should be OK.

Nick

[kennybgr8]

Hi Nick what I did to check the pump was working was just wire a battery to it and it sprang into life but still no start when I turned the ignition on, where is the immobilizer, and will the likes of halfords have relays or is it a specialized place you can get them, thanks for your help again,,,

[FoxTVR430]

Then as Nick said it could be your immobiliser. But I have no experience here, maybe someone will along soon to help.
If you would like to order the fuel pump relays I bought them HERE. they were delivered quickly, I think a couple of days.
Simon