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#1
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Ran gasoline through the engine
I know it's stupid, but I ran about 20% gasoline 80% diesel in my 84 300CD for probably 40 miles. I added some 2 cycle oil to help with lubricity. There were some hiccups but it ran. I drained the tank and changed the filters afterward. And a couple days later I had the car lose power and stall while I was driving. I swapped the pre-filter on the side of the road and got home. I also have an algae problem in the tank and have to change the pre-filter every other day or so, but it was stuttering and stalling even with the new prefilter. Anyways, did I damage the fuel pump or the injectors? Is that what's causing the rough idle and stalling? Thanks for any info.
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#2
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I have run gas through although in much smaller quantities. I think the issue with gas is it will burn, but does not have as many BTUs as diesel so you will always need to cut it with something else. I think there's also some issues with lubricity on the pump with gas, but you may have normalized that by adding the 2-stroke oil. A lot of people have run a lot of interesting fuel brews on these. I doubt you did much harm in 40 miles.
When you say stuttering and stalling, it sounds like it is fuel deprived. You have a primary filter, the pre-filter and a strainer in the tank. I would try running off diesel purge in a bottle and drive around for a few miles that way to see if it fixes your issues. If it does, your problem is somewhere in or around those parts. This article may help: http://dieselgiant.com/injectorcleaning.htm Your injectors could also need to be cleaned or have the nozzles replaced, although I think that would be a secondary issue. I have never heard of them causing stalling, but maybe a bad idle. Dkr. |
#3
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As a point of interest, why did you do that? Was it a mistake or were you trying to solve some problem?
I bought my wife a new '83 300SD and she filled it with gas about a week later. Drove it a little way (do not remember, maybe just out of the filling station) and it conked out. Had it towed to the dealer and they said I had two options tear down the engine to see if anything was damaged - or drain out the gas, fill with diesel, and drive it and see if anything happened. We drove it and never had a problem. So maybe you did not harm anything. |
#4
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Gasoline is very hard on the valve seats. Hopefully it wasn't concentrated enough to cause damage, but that's where it would to be. I think your next move is to clean or change the tank strainer. This could be your bio infection. A fcouple of questions:
- What's in the tank now? - How full is the tank? |
#5
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I would at least add some Biocide to kill the algae. I think the two stroke oil is not a bad idea, even while running pump Diesel. It definitely can't hurt. Continuing to dilute the fuel in the tank with Diesel should eventually bring it back to normal. However, that is assuming the algae problem is solved as well......Rich
__________________
All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#6
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Me ?
I'd drain and remove the Tank for cleaning...
I'd change ALL filters... I'd Loosen and Drain ALL fuel Lines,Completely... I'd remove the "Hard" fuel lines between the I.P. and the Injectors AND run Diesel Purge through the IP until it shows. BUT Then I'm a Fanatic! Reality is : Drain everything you can. Replace everything that's a filter. Dump some CLEAN Diesel 5 Gallons mixed with Lubro Moly's Diesel Purge (Whole Can) AND Starbrite's Diesel Fuel Cleaner called "Startron" 8 Oz. (It'll Kill The Algae.) AND 8 Oz Marine Grade Synthetic 2 stroke Oil. MIX all this together BEFORE pouring in Tank.
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'84 300SD sold 124.128 |
#7
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I've been thumbing through the old receipts from the PO of my SD.
Two receipts were for "customer's car stalled and was towed in. Gasoline found in tank." The PO did it twice. They drained the tank and refilled (at a significant cost) and lived happily ever after. Luckily the car just conked out instantly. Each bill was made out to the PO's wife. I bet she just drove out of the station after filling up on gasoline. So the car runs fine for me. I'm a little disturbed that my compression is only 340 psi across the board. Maybe it was the gas. Or something else. I used to dilute my WVO with gasoline to thin it out for my 250D back in the day. I couldn't kill that car. I used about 25% gasoline. No problem except my trunk (WVO tank was mounted there ) stunk like gas.
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79 300TD “Old Smokey” AKA “The Mistake” (SOLD) 82 240D stick shift 335k miles (SOLD) 82 300SD 300k miles 85 300D Turbodiesel 170k miles |
#8
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It was an accident. I pulled in to my usual pump, but there was a guy next to me with stuff spewing out of his engine bay so I pulled forward to a pump with a green gasoline nozzle. I was distracted enough by this guy that I didn't notice what I was doing. Then I chose to bite the bullet and drive home instead of calling for a tow.
I already drained the tank. It's about 3/4 full now with diesel but probably a bit of gas residue. MxFrank: I hadn't considered the valve seats. It'll be a shame if I did them damage with a careless mistake. compress ignite: I've drained the tank but ill add that cocktail you recommend. It couldn't hurt. I got a quote to drop and clean the tank for $300. Should I wait until after to add the moly/starbrite etc? Thanks. This all comes the day after I install new Bilstein HD shocks and it rides like brand new. |
#9
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I would be very surprised if the engine is damaged. The lubricity is bad when gas mixed with diesel, it all depends on percentage. Your percentage should be OK as the OM617 is very robust. It is a bit pre-mature to clean the tank.
This is what I would do. 1) Change the pre and secondary filter ( fill the 2nd filter with diesel first ). 2) By-pass the tank and run diesel purge and see how it goes. 3) If it runs bad then some damage might have been done. One hopes not. 4) If it is OK then I would just pour a gallon of SVO, motor oil or Marvel Mystery Oil in the tank then fill up with diesel. I think it would be OK. Good luck.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#10
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It's horrible on the valve seats and the pistons and injectors and pump, but I think it's fine. The OM617 is a TANK. Drain the fuel, mix some startron in there with MMO or 2 stroke oil and run diesel purge thru it and drive it. The car is fine I bet.
Don't forget your filters as well. If it runs bad on Diesel Purge which provides perfect combustion because of its incredibly high cetane numbers, then you will know you have a problem.
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#11
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Ok so by running the diesel purge I can rule out problems with the tank. Good thinking. Ill do the purge and if all goes well ill add some MMO and Starbrite to the tank. Ill post later with an update. Cross your fingers. Thanks guys.
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#12
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Quote:
I would do the diesel purge first. If you don't look at it first, it's possible the tank is much cleaner than you think and the problem is elsewhere. Dkr. |
#13
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The gasoline has just loosened up the deposits in the tank blocking your filters quicker.
The gasoline will not hurt the engine, lots of owners run vegetable oil thinned down with gas , me included to no detriment. |
#14
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Given diesels generally use harder valve seats / valves than gasoline engines , I doubt that would occur.
The real issue with long term gasoline in a diesel is injector tips / glow plugs burning off. I'd call your gas use short term and current condition more related to the preexisting sludge in the tank. Given the gas ratio was low, I'd say it stirred up sludge in the tank clogging filters. Concentrate on fixing that, Don't use MMO , it does nothing to help you or any other situation beyond lubing a rusty bolt and is a waste of $. Be sure to pull the in tank filter and clean / replace. The diesel filter has a coarser screen than the gas one. You might even need to pull the tank and clean it if sludge is that bad, using additives like the mentioned Starbrite is more preventive than a fix. Doing something nearly at random then " crossing ones fingers and hoping it works " isn't good diagnostic practice. |
#15
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I'd just run it. I'd use the biocide for the bacteria and change the filters until it all comes clean and forget about it. Its clearly not good for the system but a short term run of it seems pretty unlikely to hurt it much.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
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