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Runs Rich after Fuel Pump Replace

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7.4K views 15 replies 8 participants last post by  Rajder  
#1 ·
I've got a question that I'm hoping someone like Rylan at the Vic Shop may be able to answer. I recently had my fuel pump replaced on my 2011 XC. The original fuel pump was fine but the sending unit for the fuel gauge went bad (my fuel gauge died). To fix it they had to replace the entire pump unit. The work was done by the local Victory and Polaris shop but they are your typical small time Victory dealerships. They are typically more focused and experienced with Polaris products and don't have near the Victory knowledge that people like Rylan does. The only reason why I had them do the work (instead of myself) was that it was warranty work.

Anyways, after they replaced the pump my bike now runs extremely rich. It's rich enough that I can smell fuel, and my fuel economy dropped to 32 mpg from what is typically 38-40 mpg. I just reloaded my power commander map to see if that helps fix the rich condition. But I was wondering if any of the experts had seen this before.

I'm slightly concerned that the mechanic might have screwed up the fuel pump install and that is causing the rich condition. Though I am hoping that the new fuel pump has simply messed with the PCV map and by reloading the map it will fix the rich condition. Has anyone ever seen this happen when replacing parts like this? Thanks.
 
#2 ·
I am no expert BUT a fuel pump is just a fuel pump if it is putting out within specs I think 50 psi then that is all you need to know. Running rich would be a seperate problem. The pump is just a delivery mechanism what get's to the cylinders is somebody elses job. Fuel Map???
 
#3 ·
The only thing I could think of that might cause it to be rich is that the new pump has higher pressure then the old one.
 
#4 ·
A couple of things came to mind, but none of them definitive.

1) The bike was originally tuned with a pump that maybe was low on volume or pressure? I've seen Xbike filters get clogged by the 25K mileage mark which will affect the fuel delivery. I doesn't sound like your bike has that kind of mileage on it though...
2) They did something to the bike when it was apart. Like unplugged the 02 sensors when they had been plugged in or vice-versa. Even though the sensors should always be unplugged, I've seen people run their PC's with them plugged in by mistake
3) Just weird coincidence that the PC may be failing. Did the numbers on your map differ from the ones you had saved that you reloaded.
 
#7 ·
1) My bike has 24K miles on it. There may be something to the filters getting clogged.
2) The O2 sensors were unplugged before and are still unplugged.
3) I didn't pay attention to the numbers on the map before I reloaded PCV. I should have checked that.
 
#5 ·
That is what I was thinking. A fuel pump is just a fuel pump. So unless the fuel pump is higher pressure I was thinking that the guys who replaced it might have screwed something up during the install. But I also can't really think of what they could have done wrong for the bike to still run but run really rich.
 
#6 ·
There is not much to screw up when installing a fuel pump. I mean if there was no pressure and it didn't run, then yes. But since it runs fine I think they did the pump replacement fine. It's the rest of the bike I was worried about. The "hey, lets do this guy a favor and plug in his 02 sensors" or something like that.

Also check the map and make sure it is the same as the one you have on file. I've seen PC's fail and start throwing out random numbers on your map.
 
#8 ·
Now that you said that. I didn't actually check to see if they plugged the O2 sensors back in. I just assumed that they left them alone. I'll check on those when I get home. I haven't ridden the bike since I reloaded the map (I did it last night). I'll have to ride it a bit and see if the rich condition continues after I reloaded the map. And if it does I'll check the numbers on the PCV map. Thanks for the help Rylan!
 
#10 ·
The O2 sensors were not connected so that wasn't the problem. I don't know if it is a bad PCV yet because I'm in the process of running another tank of gas through the bike after I re-loaded the map. I feel like the bike is still running rich but I need to burn a tank and check the fuel economy before I can tell for sure. I'll know for sure if it is still running rich by the end of this week and I'll update the post then.
 
#12 ·
I do manually calculate the mileage. The mpg that shows up on the dash has never been accurate. I normally get around 38 mpg and the dash will read about 44 mpg. After the fuel pump change I'm getting about 32 mpg and the dash is showing about 38 mpg.

The miles per tank has dropped significantly (obviously since I'm getting less mpg), I can sometimes smell the fuel, throttle response isn't as good, and my backfiring has increased significantly. I'm still in the process of running a tank through the bike after I reset the PCV map. We'll see what happens.
 
#13 ·
Maybe when your bike was first tuned. The fuel pump was not making enough pressure and the Pcv was set rich to make up for below spec pressure. Now with a new pump make the correct pressure it is too rich. Maybe a new dyno run or auto tune will fix it.