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Message started by kimpal on 03/30/16 at 18:07:37

Title: 2009 S40 looses power after refill
Post by kimpal on 03/30/16 at 18:07:37

Hello,

Here is when it happens.
1. Bike is running fine. It reached almost empty tank. No problem so far.
2. I refill bike to full tank and go home - ride about 2 miles. Still no problem.
3. Next morning for first few miles it intermittently looses power .... even stops while at 25-30 miles speed.
4. After few hick-ups/power losses ... it runs fine again (about 1-2 miles of bumpy ride).
5. It runs fine till it reach empty tank and refilled.
6. It runs fine if it is refilled every 70 miles.

So Problem happens only when it is almost empty and refilled.

What can be the problem ? Dirt/Water -- How to drain the dirt out ?

Thanks !!

Title: Re: 2009 S40 looses power after refill
Post by justin_o_guy2 on 03/30/16 at 18:13:22

Year model, miles.
Stock petcock?
I'm tempted to question the tank cap vent. A full tank develops low pressure more quickly than a low tank.
Pop the cap and see how it acts. If it runs okay a while, then starts acting up, pop the gas cap, if it runs okay a while,then acts up... bingo.

Title: Re: 2009 S40 looses power after refill
Post by kimpal on 03/30/16 at 19:25:38

Thanks justin_o_guy2 !!

Its 2009 S40.

Next full tank, I will give your suggestion a try.

-K

Title: Re: 2009 S40 looses power after refill
Post by Dave on 03/31/16 at 04:09:07

Have you installed an inline fuel filter?

Title: Re: 2009 S40 looses power after refill
Post by kimpal on 03/31/16 at 09:39:05

Dave,

No, I haven't installed inline filter.
Is it worth it ?

I read couple of posts and got lost as what is best.

If its an easy job I can install it. Which one is the best?

Thanks
-K

Title: Re: 2009 S40 looses power after refill
Post by Dave on 03/31/16 at 09:49:00


434145584944280 wrote:
Dave,

No, I haven't installed inline filter.
Is it worth it ? -K


No....an inline filter is not recommended.  They can cause "air lock" problems and cause the running symptoms you are currently having.  The bike already has screens on the petcock, and another on the top of the needle valve seat.


Title: Re: 2009 S40 looses power after refill
Post by DesertRat on 03/31/16 at 09:50:30

I have an inline filter installed:



Duralast - FF2314DL

Title: Re: 2009 S40 looses power after refill
Post by justin_o_guy2 on 03/31/16 at 10:47:55

You've got one, working out, cool. The petcock has a screen.
It's, IMO, unnecessary, redundant, restrictive.
Has been shown to be problematic.
Considering the reported Symptoms, I would tend to lean away from the filter, I know, it doesn't have one, But, if it did, the Full tank has higher head pressure. And, the Full tank requires less change in fuel level to change the internal pressure.
I'm stuck on a vent..

Title: Re: 2009 S40 looses power after refill
Post by DesertRat on 03/31/16 at 10:51:30

what IF I've removed the mesh screens?  ;)

Title: Re: 2009 S40 looses power after refill
Post by justin_o_guy2 on 03/31/16 at 10:57:14

That's a different story, and, might I add, a
Detail omitted from the post. And a not exactly inconsequential detail. You moved the filtration device. You can't say that you simply added one. Scraping a star off your chart.

Title: Re: 2009 S40 looses power after refill
Post by Dave on 03/31/16 at 11:21:22


032234223533152633470 wrote:
I have an inline filter installed:


Some folks have used them without issue....others haven't and have had problems.  The issue is that the plastic nipples on the filter are thick for strength, and it makes the hole that the fuel flows through very small and restrictive.  Sometimes air bubbles get trapped in that small hole and won't let the fuel flow past (air lock).

The Tech Article is here......HondaLavis had one on his bike and it was working for short rides - then his bike started acting up on long rides....so he removed it.  Other folks have also had problems with the filters and chased all kinds of ignition and electrical problems that didn't really exist.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1211846392/0

Title: Re: 2009 S40 looses power after refill
Post by justin_o_guy2 on 03/31/16 at 11:25:37


58796F796E684E7D681C0 wrote:
what IF I've removed the mesh screens?  ;)


Title: Re: 2009 S40 looses power after refill
Post by DesertRat on 03/31/16 at 11:37:37

meh ...
MY filter install worked out okay for MY bike ...
I ride a daily commute ... AND no issues ...

others may have "issues" ...
YMMV ...

Title: Re: 2009 S40 looses power after refill
Post by justin_o_guy2 on 03/31/16 at 11:39:13


4E5157504D4A7B4B7B43515D16240 wrote:
[quote author=58796F796E684E7D681C0 link=1459386457/0#8 date=1459446690]what IF I've removed the mesh screens?  ;)

[/quote]


Clear that up.

Title: Re: 2009 S40 looses power after refill
Post by DesertRat on 03/31/16 at 12:04:48

I'm running BOTH, did NOT remove the filter mesh on the petc0ck.

I was addressing the issue brought up that there's already a "filter/mesh" on the petc0ck. IF one were to remove the redundancy from the petc0ck (mesh), an external filter would be "okay" and necessary.

Mine works with BOTH installed. I don't care if others have "issues" with my setup, I found one that works in my situation and will continue to ride as is ... ain't skeered ...  ;)

Title: Re: 2009 S40 looses power after refill
Post by Dave on 03/31/16 at 12:19:35


5D7C6A7C6B6D4B786D190 wrote:
Mine works with BOTH installed. I don't care if others have "issues" with my setup, I found one that works in my situation and will continue to ride as is ... ain't skeered ...  ;)


Nobody is trying to talk you out of using yours.

I don't recommend that anyone install an inline filter in hopes of preventing a problem - when it is just as likely to cause one.  The bike already has two methods of straining the fuel (petcock filter and needle seat filer - and both of them do a good job of stopping any dirt from reaching the float bowl.  All gas stations have filters on the pumps that keep junk from getting in your tank, and unless your tank is rusty inside....there won't be any dirt generated from the inside of the tank.

And....the fuel filters can be a big restriction in the fuel flow.  The stock fuel hose is 8mm inside - and most folks can't find that so they use 5/16" hose....and both of them provide a diameter of not less than 0.3125 inches.....a flow area of 0.0767 square inches.  If you install an inline fuel filter that has a 5/16" nipple, the inside diameter is most likely about 1/4", as a result of the plastic nipple being 1/32" thick.  A 1/4" orifice has a diameter of 0.25", and a flow area of 0.0491 square inches.  So 0.0491 divided by 0.0767 is is 64%.....so you only have 64% of the flow area the original fuel hose provided.


   

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