stupid mixed gas question

[MH Hawker]

Re: stupid mixed gas question

Its is a lot easier and safer to drain the boat tank and use the right mix and yes disable the injector pump. People have been running pre-mix oil and gas since around 1930, it aint rocket science. As far as burning it in a car or truck it will run just fine, what ever oil is mixed in wont matter one bit and what ever gas is in the tank will thin it out and its fine.

Some do fill or add gas then add the oil, others put in the oil then add gas. When filling my boat tanks I always add the oil before I pump in the gas to get a good mix, but my tanks are filled at the marina and used right off. The gas being pumped in mixes it with the oil.

Here is a chart
http://www.challengers101.com/files/FuelMix.pdf

 

[tazrig]

Re: stupid mixed gas question

I would just get the injection system fixed. I know cost is an issue but there has to be a dealer somewhere that is parting out a motor or someone on craigs list, eBay, local news paper or boat advertiser etc. doing the same. Get on the phone and start calling every dealer. If they say no ask who they could recommend. If the engine was designed to run on 80:1 at idle and up to 50:1 at WOT you are just looking for trouble down the road trying to mickey mouse it and split the difference which could end up costing you more that $200. Do it once do it right...

 

[MH Hawker]

Re: stupid mixed gas question

Buy a four-stroke, and be done with that oil and gas mixing nonsense.

And lose the bug smoke repellent are your crazy

 

[greenbush future]

Re: stupid mixed gas question

So what will a new 90 HP merc run you?
Compared to fixing the oil injection system?

If you really want to disable this system, go for it, just make sure you follow the instructions offered. Lots of motor heads dont trust injection systems but they also know how to do this.

The air compressor idea, not good at all, do you have life insurance?

And if you read the label on your MARINE oil you should be using in your Merc, you will see why it is not the same as weed eater oil. Cutting corners on 2 strokes isn't a good choice, they eat pistons and cylinder walls really well.

I have the same 90 merc you do, 50-1 as defined in the manual.

And running that mix in your truck will just foul your plugs and gum the inside of your truck up really nice, not a good idea either.

 

[Wind dog]

Re: stupid mixed gas question

run it in your mower your car anything thats gasoline powered. wont hurt a thing

I tried this in my newer sears mower, the plug fowled before I could finish the lawn, works fine in my older edger though.

 

[Silvertip]

Re: stupid mixed gas question

Buy a four-stroke, and be done with that oil and gas mixing nonsense.

But then you are bothered with oil changes, clogged injectors, oil filter changes, making oil, valve checks and adjustment and disposal of the oil and filters. And when the ECM goes bad, well, get a grip on the wallet.

 

[Silvertip]

Re: stupid mixed gas question

It doesn't matter when or how oil is added to fuel (before or after fueling). If the boat is on a trailer it will be mixed the minute you leave the driveway. Two stroke oil today is much different than when SAE 30 weight conventional motor oil was used. You really had to shake the tank to get that stuff mixed.

 

[glenn property of pam]

Re: stupid mixed gas question

I tried this in my newer sears mower, the plug fowled before I could finish the lawn, works fine in my older edger though.

last 22 gallons in my sears mower was pre-mix with stabiliser and i didnt have a problem even when the gas was 9 months old. Last week was the first fresh straight gas and i kinda miss the smell

 

[glenn property of pam]

Re: stupid mixed gas question

to the op if you can not afford to rebuild the oil injection pump then follow the directions and disable it then put the parts removed in a bag and store them for a day that you can afford or decied to do it. Adding 50:1 on top of 32:1 in the tank would be a little smokey so the plugs might be fouled. disabling the injector would bring you back to 32:1 which will work. add a couple of gallons of gas if you want but 32:1 wont hurt the motor it will just foul the plugs if anything (most people say they mix 50:1 but we are human so everyone mixs closer to 45 to 40:1 as they always add just a little extra just in case). replace the plugs and see if that fixs the problem as you have no real idea if this is the real problem as its the first run of the season.

 

[Texasmark]

Re: stupid mixed gas question

I'd love to but I cant find a rebuild kit for it. a replacement pump is over $200 :facepalm:

I mean if anyone knows where I can get a rebuild kit for one that would be awesome but I looked all winter.
90hp mercury serial OB275xxx

Save your money and use premix. Then you don't have to worry about what the pump is doing or not.

Mark

 

[crabby captain john]

Re: stupid mixed gas question

That little bit of oil/gas mix will not hurt your truck. Put it in and fill it to dilute it...

 

[81_chapparel194]

Re: stupid mixed gas question

And running that mix in your truck will just foul your plugs and gum the inside of your truck up really nice, not a good idea either.

hmmm tell that to someone NOT A.S.E certified with 15 years mechanical experience.. unless you mixed your oil 1:1 but at the standard 50:1 you wont be fouling out the plugs in your car/truck. i have done this many times as sounds like many other folks on here. as for your mower sounds like your plug was already failing. the WORST case scenario you get a little smoke from the exhaust. i have even ran ~2 gallons of diesel fuel to a tank of gas in my truck. long story but had a customer fill their diesel p/u with gas and was a mix of diesel and gas and i pumped their tank into a tank and ran it in my truck with no issues. so was it designed for the 2 cycle oil? of course not.. did it harm anything NO!! or if you have the spare cash lying around just discard the old gas and dont worry about it. but at 3.69 a gallon i will take all the 50:1 ratio gas you give me for my truck.

 

[stackz]

Re: stupid mixed gas question

but at 3.69 a gallon i will take all the 50:1 ratio gas you give me for my truck.

true statement. gonna run the gas I pump out in my mower and weed whacker this year, might pull out the generator and run it a while as well since its been sitting up a couple years... maybe burn some trash with it too.

 

[stackz]

Re: stupid mixed gas question

I guess while this topic is still active...

found a couple pumps on ebay. the breakdown for my pump is mercury part #42959A-1, all those I find are used. I also see some 42959A-2 pumps. used and new. one auction says the A2 pump is a number that supercedes mine (making it the same). When I see this I like to search online to check other parts stores for confirmation...but I cant find this supercede chain anywhere. I might just be looking in the wrong areas though.

anyone know if the A2 pump is the newer part # for mine? I still dont understand why mercury replaces part #'s either. I've never seen any "improvement" on the newer numbers vs. the older ones...

Also, would you trust a used pump? still cant find any rebuild kits for these things sigh. thats all I really want.

 

[Triangleboater]

Re: stupid mixed gas question

I looked for a while for a rebuild kit for the vro pump on my johnson, didn't find one just ended up using premix...a little more annoying but, in the end it's not bad. I vote do the simple thing. Disable it, run the gas in other stuff, and fill it with 50:1. Here is how I fill empty tanks. Put a gallon in, put the oil in, the put the rest of the gas. Makes sure it mixes right. If there is fuel already in there, just add the oil then the fuel.

Depending where the gas tank is on the boat. You can get a stick with some measurements and dip it to see how much fuel you need to add to get the proper mixture.

 

[81_chapparel194]

Re: stupid mixed gas question

I looked for a while for a rebuild kit for the vro pump on my johnson, didn't find one just ended up using premix...a little more annoying but, in the end it's not bad. I vote do the simple thing. Disable it, run the gas in other stuff, and fill it with 50:1. Here is how I fill empty tanks. Put a gallon in, put the oil in, the put the rest of the gas. Makes sure it mixes right. If there is fuel already in there, just add the oil then the fuel.

Depending where the gas tank is on the boat. You can get a stick with some measurements and dip it to see how much fuel you need to add to get the proper mixture.

with the newer oil its not necessary to mix and shake and worry about the mixture. i always pump gas first then oil or else i wouldnt know how much oil to use.. unless my tank is bone dry. so i fuel then mix oil.. but i then drive to the ramp. but i have fueled up at the marina added oil then drive off.. no issues. if it was the old oil sae 30 then it didnt mix too well. but the tc-3 oil mixes real well with gas. why does every one get paranoid about the oil mixing with gas?? if you really want to analyze it oil is heavier than gas so why not worry about the oil/gas seperating while you are docked in the slip for a week at the time???? (no concern) the tc-3 oil is formulated specially to mix with gasoline. the only positive thing to fuel after oil i can see would be to flush the filler hose of any excess oil residue left behind.

 

[greenbush future]

Re: stupid mixed gas question

hmmm tell that to someone NOT A.S.E certified with 15 years mechanical experience.. unless you mixed your oil 1:1 but at the standard 50:1 you wont be fouling out the plugs in your car/truck. i have done this many times as sounds like many other folks on here. as for your mower sounds like your plug was already failing. the WORST case scenario you get a little smoke from the exhaust. i have even ran ~2 gallons of diesel fuel to a tank of gas in my truck. long story but had a customer fill their diesel p/u with gas and was a mix of diesel and gas and i pumped their tank into a tank and ran it in my truck with no issues. so was it designed for the 2 cycle oil? of course not.. did it harm anything NO!! or if you have the spare cash lying around just discard the old gas and dont worry about it. but at 3.69 a gallon i will take all the 50:1 ratio gas you give me for my truck.

Appreciate the experience speaking, as a mechanic, you have far more knowledge than me. My truck cost well over $50K so to have problems diagnosed, I think the dealer charges about $80-90 per hour. Pouring oiled down gas into my truck just isn't in the cards. I'm glad you have never had any problems with doing this, and if you did, you could most likely diagnosis and fix.

 

[RogersJetboat454]

Re: stupid mixed gas question

Would you care to elaborate on that?

Air cooled oil, designed for an engine running at higher temps.
Marine 2 stroke oil, designed for a liquid cooled engine running at lower temps.

 

[glenn property of pam]

Re: stupid mixed gas question

i have to put my oil in first as my fill hose has a bend that holds gas until its been rocked around abit so i put the oil in the the gas flushes it into the tank

 

[Roberthill]

Re: stupid mixed gas question

With all the smoke you could become a member of the "Volunteer Mesquito Control Division"