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Old 23-05-2012, 11:26   #1
SDI200
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Petrol in diesel 400, how to drain the tank?

My car, 98' 400 GSDi, has 5 litres of petrol in a nearly empty tank of diesel!! Long story.... The car has not been started since the petrol was added on the drive at home. How can I completely drain the tank? I don't want to run the pump up And get petrol in the system to empty so is sythoning my only option?
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Old 23-05-2012, 11:37   #2
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tbh i would probably just fill the tank with proper derv and not worry about it..... and then keept it topped up as sson as it drops to a 1/4 or so.... for a bit.

other option would be to unplug the fuel filter and fit something to draw the fuel out from there.... (the priming bulb would work but would take forever)
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Old 23-05-2012, 11:40   #3
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Quote:
Originally Posted by p_b82 View Post
tbh i would probably just fill the tank with proper derv and not worry about it..... and then keept it topped up as sson as it drops to a 1/4 or so.... for a bit.

other option would be to unplug the fuel filter and fit something to draw the fuel out from there.... (the priming bulb would work but would take forever)
I put a gallon on petrol in the derv when I first bought it about 2 years ago. I filled it with derv and ran it. I kept it above 1/2 a tank for about 3 - 4 months and then changed the filter while I was doing a service. Had no problems with the car since.

Your could drop the fuel tank to empty it, the thought crossed my mind at the time as the RAC wanted 200 to do it.
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Old 23-05-2012, 11:48   #4
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It shouldn't be a problem. Just fill up with diesel and change the filter after you've used a couple of tanks. You'll find that plenty of us have done similar without any issues.
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Old 23-05-2012, 12:15   #5
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A few years ago, Top Gear tested the effects of incorrect fuelling...

My recollection may be wrong, but I think both cars survived unscathed - that's petrol in a diesel and vice-versa.

Five litres is less than 10% if you fill it to the brim - it's hard to see that making much difference. Indeed, derv mixes vary between summer and winter anyway - what you'll have is probably more or less winter diesel in summer.
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Old 23-05-2012, 15:20   #6
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1st day i had my 45 td i put 20lts of petrol in a empty tank, payed for it and then filled it with 20lts of derv and 500ml of 2 stroke oil. Car started and ran all tho it smoked a bit and ran the tank down to empty and put derv in it again, car seemed to go better that next week lol - maybe it cleaned out some carbon?
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Old 23-05-2012, 16:14   #7
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Wink

I remember mt uncle put the wrong fuel in is Renault Savanna years ago and it completely screwed it up. ECU errors etc I believe. But I know plenty of people who have done it. Though every RAC \ AA type person says its really, really bad and you should pay them around 200 to get it sorted properly...
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Old 23-05-2012, 17:11   #8
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If you do want to empty the tank you can access it from the boot area above.
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Old 23-05-2012, 17:36   #9
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Quote:
Originally Posted by minesarover View Post
If you do want to empty the tank you can access it from the boot area above.
No you can't.
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Old 23-05-2012, 19:01   #10
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Thats a damn shame ...you can on the 420....disconect the primer bulb and stick a drill pump on it.
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Old 23-05-2012, 19:07   #11
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It's incredibly annoying; you remove the access plate to be greeted with the top of the tank and no useful things in reach

Have to drop the tank on the derv to get to anything.
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Old 24-05-2012, 10:49   #12
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if you put petrol in a commaril engine you will muller then - but our old L-series is a bit agricultural ; and should take mild dose of petrol in its stride
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Old 24-05-2012, 15:14   #13
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Dr Dave did an engine swap on a 220SD that someone had put petrol in, it melted a piston if I remember correctly.

Water it down with a lot of diesel first, but you should be OK
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Old 24-05-2012, 20:36   #14
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ill have to drop the tank over the weekend
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Old 24-05-2012, 20:53   #15
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Before you go that far, try syphoning it out with a length of garden hose - but the consensus seems to be that even that much effort isn't worth it for such a small amount of petrol. (I've no idea if it's possible to syphon fuel out to such a low level, but it's got to be worth a try.)
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Old 05-06-2012, 18:05   #16
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Wrong fuel

Simply fill it to the brim with the correct fuel and run it, you won't do it any harm. Incidentally the practice of adding petrol to the fuel for diesel engines is not that unusual as it is a practice that is sometime used in extreme weather conditions to stop the diesel fuel from waxing (and thereby ceasing to flow) on heavy plant and cranes.
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Old 06-06-2012, 01:33   #17
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Old 06-06-2012, 08:39   #18
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Did the same last month, put 15 petrol in my 75 diesel.
Filled up the rest with diesel, ran fine.
Dont drop the tank, just go with it.
John
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