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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 07-15-2013, 01:07 PM   #1 (permalink)
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replacement fuel pump relay for better mileage?

Has anyone heard of this or done this? Apparently it's the K5 (I think) relay in the fuse panel. I was talking to a kid at Advanced about getting better mileage and he said he bought his on ebay for like $20. I don't remember what he said to search for and I tried searching for a fuel pump relay but it kept coming up with OEM replacements.
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Old 07-16-2013, 11:09 PM   #2 (permalink)
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how would a fuel pump relay make it get better mileage? All a fuel pump relay does is turns on and off the fuel pump. And when the engine is running, its in the "on" position, unless if you lose oil pressure
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Old 07-17-2013, 07:44 AM   #3 (permalink)
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That was my thought also. I think that dude was full of it.

On another note, I just ran a full tank with a bottle of Techron Concentrate and the idle has calmed down some and I got slightly better fuel mileage (almost 2mpg more.) I'm going to run through this tank and then run another bottle of TC, as I've read that a second bottle is where a difference is really noted. My dad had good results using it in his 97 Dodge van.
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Old 07-17-2013, 09:17 AM   #4 (permalink)
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A "kid" at a auto parts store said a $20 part that he got off ebay was better then something a team of Engineers getting paid hundreds of thousands of dollars to make built? SUUUUUUUURE.

Your best bet is the Techron. Its one of the only fuel cleaners scientifically shown to actually be benificial. I would use it myself but its not sold in Canada.
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Old 07-19-2013, 08:40 AM   #5 (permalink)
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I have also used this stuff for my car. It is the original fuel additive developed by the Chevron Corporation. It is usually consisting of gasoline mixed with 400 ppm of polyetheramine. It is generally used for the better performance in engines by BMW, General Motors, Honda, Toyota, Volkswagen, and Audi.
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Old 07-19-2013, 09:35 PM   #6 (permalink)
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Ive got a better fuel additive to use. Its called BG 44k, and this stuff WORKS. Downside is it is very expensive-25 bucks for a 12 oz can. But it works very well.
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Old 07-19-2013, 11:08 PM   #7 (permalink)
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never heard of it before and would like to know whats this being mainly used for as i am unaware about it completely....
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Old 07-19-2013, 11:35 PM   #8 (permalink)
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Originally Posted by Samellasmith View Post
never heard of it before and would like to know whats this being mainly used for as i am unaware about it completely....
BG 44K is used for cleaning your entire fuel system, and intake ports/valves. It is comprised of a good strong, yet flammable enough of a solvent, and certain types of detergents that literally breaks down crap that builds up in your fuel system, and carries it through the system to the injectors, and then injects into the engine and burns, leaving you with a fresh clean fuel system. I have used it multiple times on my truck, and it works phenominally, youll literally feel a difference within 5 miles. Which is WHY it costs so much. Because it WORKS. And works damn good at that. Id recommend replacing the fuel filter immediately after BG44 treatment. Not before. Because if your fuel filter is already old, who cares if more gunk and crap gets trapped in it, if your gonna replace it with a brand new one. I need to replace the one on my E30, coz I used 44k in it. Not recommended, but I made a very strong version of it. By only adding 1.5 or 2 gallons of gas, and half a can of 44k. One can is MEANT to be added to anywhere between 5 and 20 gallons, so the mix I made was very concentrated, but it cleaned my fuel system on the E30.
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