Swirl in Gas Tank - BMW Luxury Touring Community
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post #1 of 13 Old Jun 7th, 2015, 9:51 pm Thread Starter
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Swirl in Gas Tank

I have replaced the in-tank fuel hoses with OEM hoses when I changed out the fuel filter and now I am having an issue with low power and a swirl in gas tank when ignition on. I took the tank back off thinking that the worm clamps might have give -way but they were fine. I went ahead and replaced them with FI clamps to see if it would make a difference. No change. The gas is probably about 5 months old.

I do have the QD clamps under the tank if that makes any difference.

I inspected the hoses and couldn't see any noticeable splits, etc.

Any thoughts?

I have scoured the site but couldn't find a whole lot on this issue.

Thanks. james

James Hart
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post #2 of 13 Old Jun 8th, 2015, 12:20 am
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Re: Swirl in Gas Tank

sounds like a leak is still there, maybe you have a split in the filter, have you got the q'd hoses on the correct way, don't now what else it could be

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post #3 of 13 Old Jun 8th, 2015, 9:38 am Thread Starter
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Re: Swirl in Gas Tank

I spoke to another BMW shop who indicated that the fuel pump has a return line and that it is normal to see a swirling action of sort in the tank due to the return line when ignition is on.

If that is correct, I am hunting a problem down that does not exist.

James Hart
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post #4 of 13 Old Jun 8th, 2015, 11:24 am
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Re: Swirl in Gas Tank

Quote:
Originally Posted by beemer100 View Post
I spoke to another BMW shop who indicated that the fuel pump has a return line and that it is normal to see a swirling action of sort in the tank due to the return line when ignition is on.

If that is correct, I am hunting a problem down that does not exist.
Do you see the swirling when the key is on and the bike not running?

Robert

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post #5 of 13 Old Jun 8th, 2015, 11:34 am Thread Starter
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Re: Swirl in Gas Tank

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Originally Posted by Scouter-50 View Post
Do you see the swirling when the key is on and the bike not running?

Robert
Yes

James Hart
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post #6 of 13 Old Jun 8th, 2015, 12:58 pm
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Re: Swirl in Gas Tank

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Originally Posted by beemer100 View Post
Yes
You should not see any movement of fuel when the pump runs. Try lowering the fuel level enough to uncover the hoses to see if they are spraying out from somewhere. On my bike the short straight(er) piece had a 1/8" split above the clamp. Bike would miss at higher RPMs.

Robert
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They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.
Benjamin Franklin (1706 - 1790)


2000 K1200LT "Latifah"
1994 R1100RSL (wife's)
1981 R80GS
1976 R90S
1965 R80/2 Frankenbike (wife's)
2001 Bunkhouse LX (given to son)
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post #7 of 13 Old Jun 8th, 2015, 1:26 pm Thread Starter
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Re: Swirl in Gas Tank

Quote:
Originally Posted by Scouter-50 View Post
You should not see any movement of fuel when the pump runs. Try lowering the fuel level enough to uncover the hoses to see if they are spraying out from somewhere. On my bike the short straight(er) piece had a 1/8" split above the clamp. Bike would miss at higher RPMs.

Robert
Thanks Robert. I'll try that and see if I can tell if its one of the hoses. The problem I am having is that I put on brand new OEM hoses. The old hoses were working fine.

I may need to go back to the old theory . . . if it aint broke, don't fix it. . .

James
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James Hart
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1992 Yamaha Virago 750 (given to friend)
River Oaks, TX

Last edited by beemer100; Jun 8th, 2015 at 1:45 pm.
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post #8 of 13 Old Jun 8th, 2015, 4:13 pm
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Re: Swirl in Gas Tank

Is it gas with alcohol init, if so 5 months is a long time to have it sitting around, maybe try some fresh fuel, just a thought

Gary
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post #9 of 13 Old Jun 8th, 2015, 4:31 pm
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Re: Swirl in Gas Tank

Swirl in the tank generally comes from one of two places, either a leak in the supply side or from the return line if the pump is running. A small amount of swirl or movement is normal when the rail charges prior to the start of the engine. If it runs normally, everything is probably fine. If it started running poorly when you changed out the filter, etc. then something is likely amiss.


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post #10 of 13 Old Jun 8th, 2015, 6:55 pm Thread Starter
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Re: Swirl in Gas Tank

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Originally Posted by deanwoolsey View Post
Swirl in the tank generally comes from one of two places, either a leak in the supply side or from the return line if the pump is running. A small amount of swirl or movement is normal when the rail charges prior to the start of the engine. If it runs normally, everything is probably fine. If it started running poorly when you changed out the filter, etc. then something is likely amiss.
Dean, I would consider it a small amount of swirl, but I am not a "Swirl Expert" : ). It did start running poorly after the filter change (24k service). One thing I did notice odd as wel is that the mpg was in the dumper (ie 7 mpg upon starting out and it then gradually went up to about 25 I believe). I would think this has something to do with the computer on the bike.

Thanks all for your advice and suggestions.

James

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post #11 of 13 Old Jun 9th, 2015, 12:11 pm
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Re: Swirl in Gas Tank

Something is wrong with that mileage. I would personally say that anything below 40 is very suspect, particularly if that's highway miles.


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post #12 of 13 Old Jun 10th, 2015, 8:00 pm
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Re: Swirl in Gas Tank

I get 28 MPG going 75 MPH in a head wind pulling my Bushtec trailer. Normally about 38 with the trailer and 42 without. I do get 50 in the Rockies. 2005 over the last 11 years.

John
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post #13 of 13 Old Jun 10th, 2015, 10:00 pm
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Re: Swirl in Gas Tank

Quote:
Originally Posted by beemer100 View Post
Dean, I would consider it a small amount of swirl, but I am not a "Swirl Expert" : ). It did start running poorly after the filter change (24k service). One thing I did notice odd as wel is that the mpg was in the dumper (ie 7 mpg upon starting out and it then gradually went up to about 25 I believe). I would think this has something to do with the computer on the bike.

Thanks all for your advice and suggestions.

James
Have you reset the motronic using the method described on this forum?

Bob Lower
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