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SUVs Honda CR-V Honda CR-V Real World MPG
777 messages, Last post on Nov 03, 2009 at 2:32 PM
You are in the Honda CR-V Forum. Your Hosts are steve_ & tidester
Your Community Leader is varmint.
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Replying to: d07 (Nov 19, 2008 2:23 pm) re you stated ".... To reduce the occurrence of this chore, try to never let your tank of gas fall below half mark. That way the filter won't get clogged with sediments picked up from the very bottom of the tank - there is a lot of gunk there anyway at all times...." Does the fuel pump suck the gas from very bottom of gas tank always like the tube is fixed there no matter the tank is full or 1/4, empty OR the fuel pump suck the gas by floating at different level depending how much gas in the gas tank?
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Replying to: bigdadi118 (Nov 23, 2008 2:00 pm) I believe this to be true. But the chances are that when the tank is near empty or closer to it, the sediments and gunk are sloshed about more vigorously given the empty space, even though there are baffles inside the tank. The probability of dirt getting into the fuel lines is significantly increased when the fuel is at a lower level. Hence its better not to let the fuel level get low. The penalty you pay is that the mpg is lower with the added weight of fuel compared to a half tank that is. But this is the lesser of two evils as dirt in fuel lines is detrimental in the long run to the engine as well as economy. Now a large percentage of the impurities is water - due to condensation etc. So its actually a great idea to actually add some additive occasionally to hold onto the water and get rid of it through combustion in the engine. I think that most fuel system cleaners attempt to do this. Done as part of a regular regiment, the fuel system will be considerably clean and that results in longevity of the vehicles components.
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Replying to: d07 (Nov 24, 2008 6:03 pm) Would be very interesting to find out. I agree, If that is true, the cleaner fuel would definitely be higher in the tank, and keeping the tank more full would be beneficial. Down side would be WHEN the tank is eventually run low for whatever reason, the contaminate collection might overwhelm the filter/pump/injectors.  Kip |
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Replying to: bigdadi118 (Nov 23, 2008 2:00 pm) |
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Replying to: blueiedgod (Nov 25, 2008 1:31 pm) I think most people should just gas and go. Most cars have fuel filters that should take care of any gunk in the tank, and I'm not inclined to fill up twice as often. |
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Replying to: steve_ (Nov 25, 2008 2:44 pm) I realize I'm not the one you asked, but thought I'd throw out some anecdotal evidence. I run a 1996 Accord with 185,000 on it, never had "fuel treatment" in it, just good ole Chevron 87.
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Replying to: thegraduate (Nov 25, 2008 4:20 pm)  I don't use them either and used to use Chevron quite a bit before switching over to grocery gas mostly. I had some injector problems a while back, but I have since fired that mechanic and I'm not convinced it wasn't a boat payment problem the mechanic had. |
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The only additives I'd ever use is a complete fuel system cleaner - nothing else at all. I have had poor quality fuel at times pumped into my car and I have seen a drop in performance and mpg. I know from my own experiences that not all fuels are the same. There is certainly a difference in octane and maybe some differences in the additive package. The company that produces the fuel may have standards to set and observe. But nothing stops the fuel retail outlet from tampering and sometimes even altering the percentage of ethanol or sometimes cases of kerosene in gasoline are not uncommon in some places. Even the best gasoline in the USA may or may not match the average quality of gasoline available in Germany, France or Britain. VW and Mercedes had issues with their fuel injectors getting gummed up or clogged and had to modify the designs to be more robust for use in the US. That may be why similar sized cars sold in the US and in Europe get varying mpg (also because of the difference in measuring units!) but also because of sulphur content and other factors. You can get away with no additives at all for the life of your car. But that largely depends on the design of the components and how much torture they have been through during their life cycle. If you happen to keep filling gas fortunately at a reliable location -then you probably wouldn't need additives ever to keep the engine clean. But how would you know this? - No one knows for sure. So to stack the odds in my cars favor, I'd rather add a fuel system cleaner which is NOT a snake oil but a necessity in some locations (very different from engine oil or coolant, transmission or gear box additives - these are not recommended by manufacturers) If fuel system cleaners were optional and all fuels were equal - then all used cars would have immaculate injectors/systems. Until that is proven to be the case, I'll stick to my theory. 
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Replying to: steve_ (Nov 25, 2008 2:44 pm) I think most people should just gas and go. Most cars have fuel filters that should take care of any gunk in the tank, and I'm not inclined to fill up twice as often. The only damage from running the tank dry is that the fuel pump is lubricated and cooled by the fuel. If there is no fuel and it is sucking in air, it is neither lubricated nor cooled. So, now you have a tankful of fuel vapor and hot fuel pump. I guess there is a reason why Honda set those low fuel lights at about a gallon reserve so that no one goes KA-BOOM! I use Chevron with Techron fuel additive before each oil change. I usually fill up at whatever station has the lowest price. All the fuel here in Buffalo comes out of one refinery in Erie, PA. So, it does not matter who you get it from.
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