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Added a vacuum pump and now carb overflows.. Ideas ?? Added a vacuum pump and now carb overflows.. Ideas ??
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Old 5 Jun 2010
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Added a vacuum pump and now carb overflows.. Ideas ??
I've been having fuel flow problems with my DRZ and Clark tank.

The fuel doesnt run well, especially with an inline filter.

Well, I added a Mikuni Vacuum pump. The smallest I could find. The fuel starvation problems are over which is great but now the carb overflows after a few seconds.

The floats obviously have to fight harder to close the float valve with pressurised fuel but I don't really fancy playing the "hit and miss" game with trying to set my float height so it doesnt. That's even if I can adjust them enough to fight back the pressure.

Is there another method to compensate for adding a fuel pump when there wasnt one intended ?? A different float valve perhaps ?? A flow restrictor ?

Thanks in advance !!

Ted
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Old 5 Jun 2010
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Ted

You could try putting in an other fuel line from the point after the pump and b4 the carb back to the tank as this will reduce the pressure on the carb.. ( just thinking.. you may have to drill a hole in the tank and fit a one way valve for the fuel to return to the tank. Its not a hard job and should only take about an hour.)

Hope this idea helps.

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Old 5 Jun 2010
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Among KLR owners, there've been problems with certain inline filters (and also with their mounting positions), not with others. I think installing a problematic filter, then a problematic fix for the filter, then a problematic fix for the fix....is taking you down a potentially difficult path. Instead, either eliminate the inline filter or find one which works. You might investigate one of the various KLR lists (I use DSN KLR650, a yahoo group which you can easily find) or one of the KLR suppliers (I use Arrowhead Motor Sports in Moab, Utah).

I've got an inline filter and in the 50,000 Third World km since I installed it, it hasn't shown any signs of serving any purpose whatsoever. I'd remove it, but it's easier to just leave it in place. This is the end result you want to achieve on your bike.

enjoy,

Mark
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Old 6 Jun 2010
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I agree....

Putting the pump in is probably not the best solution, but i'm a sucker for a challenge !!

The fuel filter needs to be there, especially for African jerry can fuel.

I've removed the pump and changed the filter for a bigger one, hoping it solves the issue but only time will tell.

This Clark tank is crap design. It puts the tap much lower than the carb but very close leaving a very difficult angle for the fuel pipe. It's really hard to accomodate the fuel pipe without a kink, let alone a filter. I've been having problems where the float bowl won't fill and starving the carb on the motorway hence my idea to fit the pump.

The pump eliminated the fuel starvation problems fantastically but added one too...
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Old 6 Jun 2010
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Yeh but.....what makes you so sure African fuel is such a big deal? I mean, if you like challenges that's fine, but I've used a lot of fuel out of rusty drums, jerry cans, whiskey bottles, you name it. I never had problems before I installed an inline filter, and I've not had problems since. Plus I've seen some DRZ's, and they don't all have added filters, and I don't notice them dying by the side of the roads left and right.

I do carry a water-separating funnel with a fine screen, but I've used it only a couple of times, usually to pour from my plastic fuel can on windy days (remember Patagonia?). Seems to me this might be a solution to your troubles, serving perfectly without requiring all sorts of complicated modifications, each of which invokes the Law of Unintended Consequences.

Why did you choose a DRZ in the first place? Did it have anything to do with simplicity, straightforward design or proven technologies? Or was it a question of all the available farkles you could install to make it more likely to break down or in other respects misbehave?

Just asking.

Mark
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Old 6 Jun 2010
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Quote:
Originally Posted by markharf View Post
Yeh but.....what makes you so sure African fuel is such a big deal? I mean, if you like challenges that's fine, but I've used a lot of fuel out of rusty drums, jerry cans, whiskey bottles, you name it. I never had problems before I installed an inline filter, and I've not had problems since. Plus I've seen some DRZ's, and they don't all have added filters, and I don't notice them dying by the side of the roads left and right.

I do carry a water-separating funnel with a fine screen, but I've used it only a couple of times, usually to pour from my plastic fuel can on windy days (remember Patagonia?). Seems to me this might be a solution to your troubles, serving perfectly without requiring all sorts of complicated modifications, each of which invokes the Law of Unintended Consequences.

Why did you choose a DRZ in the first place? Did it have anything to do with simplicity, straightforward design or proven technologies? Or was it a question of all the available farkles you could install to make it more likely to break down or in other respects misbehave?

Just asking.

Mark
LOL... You do have a way of putting it into perspective. Maybe I will just remove the filter if it still causes me bother.

The reason I put a filter in is because the carb has a very fine filter under the float bowl. I had the same one in my XT and it kept gumming up in South America when I ran without an inline filter.

It's a lot easier to clean an inline filter than a carb filter. The tank does have a filter, but it's not very fine (like my Acerbis XT one which allowed the carb filter to block)


You do make a VERY good point though. Why am I over complicating things on a bike I bought for simplicity !!!! ???? !!!! ????

I've removed the pump and fitted a larger, higher flow rate filter and looped the fuel line to take out tight angles. I'll see if that cures my problems.

I still would like to run with the pump if I can find a simple, easy fix for the overflow.. Even if I don't use the pump, i'd love to find a way to use one just for reference reasons. There are times where a pump maybe needed (auxilary tanks etc) and I'd like to have the knowledge and knowhow to do it...

Thanks for the reality check though, I needed it !!
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