. My rule: it *might* be 'fine' running a bit of petrol in a diesel engine - I wouldn't do it though.
I ve done many times and its fine-unless you think I m telling porkies ?
Like I say, a lot of people make a lot of money from scaring you into thinking this.
You need no jury (just an understanding of basic science) to work out that diesel into a petrol will result in engine damage-as I said above, diesel will not ignite with a spark so filling your petrol tank with diesel and turning the key will result in an engine full of diesel and it ll need to be taken apart.
Agreed but high pressure diesel injection pumps are not. There may be some confusion here as the injection pumps on older (direct injection) diesel engines certainly hate having petrol pumped though them as (as stated above) there is lubrication comes from the fuel. I don't know if the pumps used on modern common rail engines (like the Alfa) are more tolerant. Personally, I wouldn't take the risk in the absence of clear advice....
Sorry youve got that the wrong way round-OLDER, non common rail, IDI AND DI diesels are even more resilient than more modern ones.
ALL diesel pumps use the fuel for lubrication, old and new, but it would take a hell of a lot of neat petrol to cause failure due to lack of lubrication.
ALL diesel pumps are high pressure, older ones about 130bar, newer common rail ones 1200-2000bar.
If they can pressurise thicker, more viscose diesel, they wont have any trouble pressurising thinner petrol short term and certainly very little pressurising a diesel/petrol mix short term.
I know what I know, if others are happy to fall for some of the motor industry's scare tactics and like being relieved of your money, then go ahead-waste your cash !
(starts thinking how he can make money by perpetuating similar scare stories himself as its clearly lucrative !)