Low fuel , acceleration problem

8400 Views 20 Replies 8 Participants Last post by seiloG, 7 mo ago

seiloG

Discussion Starter · 9 mo ago

Hello everyone, I just bought a 2008 650dl with 13000kms .
The motorcycle lived 14 years in a garage and made less than 1000 per year.
The previous owner, one month ago, had changed the fuel pump and strainer, I got the invoice so it is true he is not lying.
Also it is completely serviced, oil , air filter, oil filter.
Now when the fuel goes to 2 or 1 line , I got starvation problems starting from 4000 rpm when I accelerate.
I cannot pass 4000 rpm even with full gas. Sometimes I cannot even overpass other vehicles , very dangerous .
When the fuel is from 3 bar and up I have no problem at all.
I have not removed the tank yet , just asking if may the venting is the problem or something worse.

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Rolex

· #2 · 9 mo ago

You need to do a fuel flow test.

There is a big chance inside the tank is rusty and it has fouled the new pump.

The fuel flow test will tell the story

Did you change the air filter, after sitting for a long time they can get messed up too.

Reactions: 1

HokiesRWee

· #3 · 9 mo ago

Somewhere, on here, is my story, of the same problem.

’07 Wee, but, several years, ago. Exact same symptoms.

In my case, replacing the in-tank fuel strainer (might be named the low-pressure filter), along with the high-pressure, in-tank filter, completely fixed the problem.

I told a good story, of that experience, here, somewhere. In your situation, I think it might be worth a quick search, to find, and read.

Good luck, regardless.

seiloG

Discussion Starter · #4 · 9 mo ago

Thank you the replies, I also suspect rusty tank because when I see inside from the cap I see rusty spots, the air filter, spark plugs are new. I will do a flow test and come back with more information.

Reactions: 1

seiloG

Discussion Starter · #5 · 9 mo ago

6

Finally I found some time to remove the tank and see what I found out.
Now I already filled it with vinegar and waiting 24 hours.
I bought a new strainer and I will try to clean the high pressure filter pumping fuel from the opposite side.
The only thing I do not know is how will I seal it to be protected in the future.
Do anyone has any positive results with a specific product or a diy method.

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seiloG

Discussion Starter · #6 · 9 mo ago

Just a final update, tank cleaned with vinegar, followed by baking soda and water flash.
No sealing just motor oil, until I filled the tank with fuel. New strainer and the same high pressure filter which had 3 grams of rust inside. From now one I will try to keep it full, to prevent rust.

BackPacker

· #7 · 9 mo ago

Did you do another fuel flow measurement after you back-flushed the pump and removed 3 grams of rust from it? I'm curious to know how effective that back-flushing really is.

Reactions: 1

seiloG

Discussion Starter · #8 · 9 mo ago

No I did not make a fuel flow measurement , even before the repair because I had the feeling that I would have different results with a full tank compared to 1/4 full. But I highly recommend to back-flush the filter, I didn`t expect to see so much rust coming out.

LabradorBoy

· #9 · 9 mo ago

seiloG said:
No I did not make a fuel flow measurement , even before the repair because I had the feeling that I would have different results with a full tank compared to 1/4 full. But I highly recommend to back-flush the filter, I didn`t expect to see so much rust coming out.

How did you back flush the filter? And how effective was the vinegar then baking soda wash of the inside of the tank? I have a new pump on the way for my Strom that sat for a couple of years but I fear the inside of my tank looks like yours did too.

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seiloG

Discussion Starter · #10 · 9 mo ago

I used an electric oil extractor pump ,the one that you use to change the oil of a car , but you can use a hand pump also. Just pump from the opposite side , there are two holes ,close the hole of the regulator somehow and pump to the other.
Vinegar is super effective(5% acid) , I used 4 x 5 litre + 2 litre of water . I left it 24 hours and then empty it in a plastic container . Add one cup of soda , water and shake it for 5 minutes. Finally with a pressure washer you will remove anything left from inside and leave it in the sun to dry . It will flash rust immediately so engine oil , will prevent it until you fill it up.
Anyway doing all these ,it will surely be better than before. Good luck

Reactions: 1

LabradorBoy

· #11 · 9 mo ago

seiloG said:
I used an electric oil extractor pump ,the one that you use to change the oil of a car , but you can use a hand pump also. Just pump from the opposite side , there are two holes ,close the hole of the regulator somehow and pump to the other.
Vinegar is super effective(5% acid) , I used 4 x 5 litre + 2 litre of water . I left it 24 hours and then empty it in a plastic container . Add one cup of soda , water and shake it for 5 minutes. Finally with a pressure washer you will remove anything left from inside and leave it in the sun to dry . It will flash rust immediately so engine oil , will prevent it until you fill it up.
Anyway doing all these ,it will surely be better than before. Good luck

Thanks for the details. The tank cleaning is def something I have to do when I go to change my pump in a couple of weeks.

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seiloG

Discussion Starter · #12 · 9 mo ago (Edited)

How you are sure that is a pump problem? It may be just one of the filters? Are you having any strange noises from the pump?

seiloG

Discussion Starter · #13 · 8 mo ago (Edited)

Just a follow up, today I went on a sunday ride and I realized that my tank is leaking fuel. I was shocked because one month ago I removed all the rust, and I was one hour away from home with sealing tools.
I was extremely lucky because at the beginning it only started dripping but when I arrived home the hole became bigger and there was a jet of fuel coming directly on the back cylinder. I attach a photo, the hole is next to the drain tube.
I am thinking to use epoxy and check again for rust. Do anyone had a better idea that will not cost too much

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Rolex

· #14 · 8 mo ago

Epoxy will work.

Have a look inside first to see how big the problem area could be.

If it looks big add some fly screen mesh to the epoxy for strength over the area, you don't want it to fail again so get it right the first time.

Reactions: 1

seiloG

Discussion Starter · #15 · 8 mo ago

I put some epoxy and covered the hole. Now I hope it holds..
The inside part, is not visible but i can touch it with my fingers and it is not rusted right now.
Generally the tank started to rust again from the moment I removed the fuel, but this hole surely had started before the first derust I made, one month ago.

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seiloG

Discussion Starter · #16 · 7 mo ago (Edited)

This is the final part of my story.
In my case vinegar made a big mess in the tank even in the healthy parts that were not rusted before.

The first time, I used vinegar , I left it for one day. The tank was cleaned and I thought that I had found the solution.
I tried to keep the tank full all the time. But one month later I had a small hole ,which was extremely dangerous and the rust was coming back.
I tried a second time with vinegar and the flash rust was so aggressive that I could not believe my eyes.
The photo is 10 minutes after removing the vinegar which was for 2.5 days and then used soda to neutralize .
For my good luck I found a nearly new tank andI finally replaced it. Black color instead of blue but who cares.

My lesson from all these, is that the vinegar will destroy any protective layer the tank had from the factory . So someone should seal it immediately , otherwise do not even try!!!!

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Reactions: 1

sabrecanuck

· #17 · 7 mo ago

I don't have this issue, Have never seen this issue but I come here to commend you for taking the time to post the followup. I'm a DIY guy too and all too often I am able to find other people experiencing the same issue(s) as me but it takes a l long time to find any of their solutions. Good work.

14ozarkstrom

· #18 · 7 mo ago

That is a extreme case i have cleaned many tanks with applecider vinegar including my 14 v strom. No big deal. Usually a valid solution. Too bad about the tank. However also replaced some did not think there was any hope.

seiloG

Discussion Starter · #19 · 7 mo ago

I am coming from a poor country that people mostly try to fix broken items than buy a new parts.
There are specific mechanics for tank rebuilding , I took an offer from a couple of them. Both told me that they use some kind of resin to seal the tanks on the end.
I believe that you have success with apple vinegar but unless you check the tanks every once in a while you are not sure what is happening inside.

Hoop68

· #20 · 7 mo ago

seiloG said:
I am coming from a poor country that people mostly try to fix broken items than buy a new parts.
There are specific mechanics for tank rebuilding , I took an offer from a couple of them. Both told me that they use some kind of resin to seal the tanks on the end.
I believe that you have success with apple vinegar but unless you check the tanks every once in a while you are not sure what is happening inside.

I recently bought an 05 Strom without looking in the tank. First time I needed gas I found it was full of rust. I tried the vinegar and had the same results with flash rusting as soon as I emptied it. I used a product called Kreem. It's a three part process and provides a coating when finished to protect from rusting again. If you take your time and follow the instructions carefully (maybe watch a few YouTube video's) it works great.

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