combo11
Member
Registered: 5th Feb 15
User status: Offline
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hi just wondering if anyone else has tried the "diesel plus unleaded trick".
just mixed a small amount of unleaded into the fuel tank of my 1.7 cdti combo .
god knows where the extra oomph has come from but top end 65mph + has never been so good .
so much more responsive in foot off foot on acceleration .
don't ask for measurements cause I didn't measure .
just had about half a pint of petrol and added it with half a tank of normal diesel .
any thing I should watch out for ?
cheers 
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GB123
Premium Member
Registered: 21st Nov 11
Location: Kent
User status: Offline
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[Edited on 05-02-2015 by GB123]
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GB123
Premium Member
Registered: 21st Nov 11
Location: Kent
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No way I'd be putting unleaded into a common rail diesel engine.
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--ToM--
Member
Registered: 23rd Nov 07
Location: Wirral
User status: Offline
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Actually it's not unheard of to put a small amount of petrol into a diesel fuel tank as it kind of does the same job as an injector fuel system cleaner from the likes of forte gets rid of the residue diesel can leave inside fuel pipes filters injectors etc just don't put too much in as the petrol will sit onto of the diesel and it'll be a bastard to start the car once started it'll run fine though
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AlexW
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Registered: 25th Oct 08
Location: Essex
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My issue is the petrol will remove all the lube from the fuel pump, which a lot of the cleaners aren't so hard on apparently.
I like a bit of 2-stroke oil in diesel, 200:1 mix though.
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GB123
Premium Member
Registered: 21st Nov 11
Location: Kent
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Wouldn't risk it on a modern diesel engine though, can't imagine the injectors would cope too well with it
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Andrew
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Registered: 5th May 04
Location: Skoda Octavia Estate, Ford Puma
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I put £7 of petrol into my Mum's diesel 307 by mistake. Couldn't be bothered with draining it and changing the fuel filter so just brimmed it with diesel.
Guess it's not too bad for it then 
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GB123
Premium Member
Registered: 21st Nov 11
Location: Kent
User status: Offline
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Not necessarily immediately
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AlexW
Member
Registered: 25th Oct 08
Location: Essex
User status: Offline
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If you're meaning what I said, I do it on modern diesel engines. I've had no issues in the 30k+ I've done it for. Its such a small amount (hence saying its 200:1) that its not going to make a huge problem.
It helps lube the pump, and helps the burn of the diesel.
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GB123
Premium Member
Registered: 21st Nov 11
Location: Kent
User status: Offline
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quote:
Originally posted by AlexW
If you're meaning what I said, I do it on modern diesel engines. I've had no issues in the 30k+ I've done it for. Its such a small amount (hence saying its 200:1) that its not going to make a huge problem.
It helps lube the pump, and helps the burn of the diesel.
More at Tom really
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baza31
Member
Registered: 19th Apr 03
Location: yorkshire
User status: Offline
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Why bother though? why make your life hard work by adding the wrong fuel? Plus we are talking about a combo ffs. They drive perfectly well as they are. Some crazy folk on here. I would prefer to know I was getting home or that it will start when I get into it than it's 65+ speeds
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
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I once got about 5 or 6 litres in the Alfa. By accident. That was 40k ago. Still going 
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Ben G
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Registered: 12th Jan 07
Location: Essex
User status: Offline
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Seems odd that this is the guys first post...
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Dee25790
Member
Registered: 3rd Jun 14
User status: Offline
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quote:
Originally posted by combo11
hi just wondering if anyone else has tried the "diesel plus unleaded trick".
just mixed a small amount of unleaded into the fuel tank of my 1.7 cdti combo .
god knows where the extra oomph has come from but top end 65mph + has never been so good .
so much more responsive in foot off foot on acceleration .
don't ask for measurements cause I didn't measure .
just had about half a pint of petrol and added it with half a tank of normal diesel .
any thing I should watch out for ?
cheers
My dad and uncle used to do this with a van and a shogun. Apparently it's quite common practice. Like the redex stuff just much better then it. I wouldn't do it too often but I wouldn't think running a bit through every few tanks can do any real harm.. It should blow a fair amount of carbon out the engine too
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_Allan_
Member
Registered: 24th Mar 04
User status: Offline
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Sure why not. I put a litre of diesel in my petrol to help with the MPG.
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tom130691
Premium Member
Registered: 13th Sep 08
Location: Daventry
User status: Offline
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Did this on my Astra, 5 litres or so in a full tank
Ran fine, fuel rail developed a leak not long after though.....
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Neo
Member
Registered: 20th Feb 07
Location: Essex
User status: Offline
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quote:
Originally posted by _Allan_
Sure why not. I put a litre of diesel in my petrol to help with the MPG.
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Tiger
Member
Registered: 12th Jun 01
Location: Leicestershire Drives:Astra VXR
User status: Offline
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quote:
Originally posted by Ben G
Seems odd that this is the guys first post...
its probably Vibrio.
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random dav
Premium Member
Registered: 7th Jan 04
Location: NSW
User status: Offline
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Or Dave A
WRLFC !
Project cars
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Balling
Premium Member
Registered: 7th Apr 04
Location: Denmark
User status: Offline
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Will the petrol ever actually reach the engine unless you run it almost dry?
Can't imagine diesel and petrol will mix.
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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People used to do this on old-school diesels to help them start in the cold weather but to do this on a modern common rail system is just plain stupid and when you're fuel pump fails we'll all laugh at you.
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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quote:
Originally posted by Balling
Will the petrol ever actually reach the engine unless you run it almost dry?
Can't imagine diesel and petrol will mix.
Petroleum is a solvent 
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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quote:
Originally posted by pow
I once got about 5 or 6 litres in the Alfa. By accident. That was 40k ago. Still going
Its a Miracle its still running regardless of what you put in the tank, its Italian
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ShEp
Member
Registered: 9th Aug 05
Location: Dingwall, Highland
User status: Offline
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Little bit of diesel in an old petrol engine doesn't do any harm, gets a bit smokey.
The garage I used to work in had a petrol station across the road, I used to run my old 8v corsa off the dirty fuel from people putting petrol into diesel cars.
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DaveyLC
Member
Registered: 8th Oct 08
Location: Berkshire
User status: Offline
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Yes but we're talking about the other way around
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