Won't start.... alarm ? Fuel pump ?????? - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 15 (permalink) Old 11-03-2021, 21:20 Thread Starter
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Won't start.... alarm ? Fuel pump ??????

Our 2003 Ducati has a Toad C4 alarm fitted which according to the manufacturers cuts power to the starter and the fuel pump when armed. Sounds reasonable.

Last time we used the MH (December) it was reluctant to start after emptying black and grey waste at service point 15 minutes from home, but start it did sand it ran perfectly.

I tried to start it a few days ago and it cranks well but will not start.

Why not I wonder ?

RAC does not exist here and being 3.8t we cannot tow it to a garage....

Could it be the immobiliser not disarming one circuit ? Manufacturer thinks unlikely but possible, we have no idea where the control unit is fitted, probably somewhere in the dashboard, but cannot contact the original fitter or the original owner as time has passed...

Suggested today tgat may be fuel pump problem.....

But really no blue so we may have to involve our insurance company who do provide breakdown over, but will they cover it at home ? Where should it go ? Local garage ? They are Renault agents but did change cam belt etc in 2019. Fiat dealer is 50km away - that will not be cheap for a 3.8t vehicle. Mobile mechanic ? Have not found one yet....

Any suggestions ?

Any typo that I make means the errorists win.

Any comments above are only MY OPINION and should be read as that.

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post #2 of 15 (permalink) Old 11-03-2021, 21:39
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Sorry to hear of the problem Dave.

I'd start by checking your breakdown insurance - you may be pleasantly surprised (hopefully!)

My breakdown (with Nationwide) does cover home.
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post #3 of 15 (permalink) Old 11-03-2021, 21:53
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You stated it is cranking over OK so would suggest slackening one injector and check if fuel coming out. This will confirm fuel pump working.


Possibly your ignition key battery is also down if not used and therefore signal to immobiliser not reaching the receiver below steering wheel.



Travel Trolls on Youtube had problems after they allowed their battery to flatten and when jump started alarm activated and wouldn't start. They charged the battery overnight and all was well.


Just a couple of thoughts.. hope it helps.


Alan

It won't be long until a wee while now.
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post #4 of 15 (permalink) Old 12-03-2021, 06:58
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I hated immobilisers as they always 'worked' when you least wanted them to. First thing I either got rid of or 'immobilised' on buying a van.

Ray.
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post #5 of 15 (permalink) Old 12-03-2021, 07:07
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First check if the fuel shut off device is working Dave.


Check the Fiat Forum too.

It's what on old diesels was called a stopper and was worked by pulling a knob on the dash. Now electrically operated.

I don't now about Ducatos, maybe it's visible or maybe not, but mostly you can hear the shut off opening as you turn the key.
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post #6 of 15 (permalink) Old 12-03-2021, 17:05 Thread Starter
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Sorted today, it was my first guess of the a,arm and immobiliser, not because of low fob batteries but due to it needing resetting for whatever reason it had decided.

I followed advice on here and from the alarm company successors as the original business was taken over by Scorpion and Sigma. Very helpful technician there who made a few suggestions which reinforced / echoed advice on here and our best friend Mr Google.

Fold back the carpet in front of the left hand seat, there is a metal plate below it, secured by cross head screws.

Unscrew and lift that up so it is easy to hear the fuel lift up (low pressure) pump as it primes the system.

Turn on the ignition and listen.....

The pump should be heard running for about 20s. If it cannot be heard, there is a fault there, if it does not cut off there is a fault downstream or perhaps the filter is blocked.

Once that was heard, I reset the alarm system - great fun with multiple moves.

Then try starting and it did 😁.

That has probably savad a small fortune for us and our insurance company.......

Thanks for all the suggestions. According to the technician that I spoke to, the inertia fuel cut off, designed to cut the fuel in the case of a shunt, fails even if the door is slammed apparently, some seem to be more sensitive than others, so just be aware - I had never heard of such a gizmo before.... 🤔

Any typo that I make means the errorists win.

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post #7 of 15 (permalink) Old 13-03-2021, 15:38
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Isn't it great when you get a problem solved Dave! That'll have made your day.
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post #8 of 15 (permalink) Old 13-03-2021, 16:54 Thread Starter
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Yes Jan, and how..... we had visions of 1000€ notes flashing from our bank account to A.N. Other (mechanic ?) as they changed everything in sight, and a few that were not......

I knew NOTHING about the inertia valve (near the vehicle battery apparently), so yet another lesson learned (thanks Alan), I wonder if I am unique in that ignorance ?

Any typo that I make means the errorists win.

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post #9 of 15 (permalink) Old 13-03-2021, 21:58
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Quote:
Originally Posted by Penquin View Post
I wonder if I am unique in that ignorance ?
I can confirm not!!

Jean
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post #10 of 15 (permalink) Old 14-03-2021, 09:05
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I used to use an Internet swith as a DIY immobiliser years ago, our first motorhome had one fitted when we got it, i knew nothing about it until it failed and the AA man found it, it hadn't been secured properly and had waggled on, I didn't know they had two pumps til then.
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