Fuel Pump will not prime

reelop19 · 06-12-2008, 10:25 PM

The bike started when I bought it. Its an 02' RC51 by the way. It had damage so for the past 2 weeks I've been working on it. At one point it did fall over. So what I need to do is go over a list of things that could be wrong.

-I changed the tank but am using the fuel pump from the old one which worked.
-I tipped it over but am not sure which is the tip over sensor or how to reset it.
-I've been checking fuses have not seen any blown ones.
-The kill switch is not on.
-The battery and fuel pump were the only electrical things disconnected.
-Battery is good everything electrical seems to be coming on.

How do you reset the tip over sensor and any other suggestions? The engine and computer are stock by the way. Why will this puppy not prime?

rokitt51 · 06-12-2008, 11:41 PM

If it was working fine, then it still should be. But sometimes there are gremlins though. Check and make sure the battery has good voltage and is connected. Make sure the fuel pump is connected. You already checked the fuses so that is good. You say the kill switch isnt on? What do you mean exactly. Whatever it is, make sure there is no short in the switch. The tip over sensor is located under the riders seat. Make sure that it wasnt placed back on upside down if it was taken off. Little wierd shaped box, you cant miss it. Should already be reset if the battery was disconnected.

reelop19 · 06-13-2008, 8:12 AM

I'll charge the battery and test some wires tonight. Fuel pump is connected.

Chum · 06-13-2008, 9:37 AM

It sounds like the tip sensor to me, but I'm no pro. I had a very similar problem. The tip sensor is mounted to the forward most portion of the battery tray. Kinda on the bottom. If you unplug it for a a sec, it should reset. If I recal correctly, the connector housing is green. Anyhow, the tip sensor is mounted in an upright position with an arrow pointing up. Two bolts holding it on. No need to dismount, just unplug and replug.
give that a shot. I would suggest doing that with the bike off.

N3D · 06-14-2008, 2:24 AM

Sounds like your connection to the fuel pump is loose. If the kill switch is in the "run" position then thats not the problem. The tilt sensor does not have to be reset, trust me on this one. I just wrecked my RC flipping it end over end a few times, set her up after laying there for about 3 hrs and she primed right up and started. A little smoke at first but no problem with the pumps priming.

I would check the connection to the battery as well, but as long as the tilt sensor is still plugged in then you shouldn't have a problem. Now if you have the sensor disconnected it will not prime.

BTW, the sensor is located directly under the battery on a flap that you can see from the rear of the bike. Its a square box with two bolts coming through that flap and has a little green connector.

Doubt the tilt sensor is going to be the problem, probably more like a dead battery (check headlights, see if they are coming on or very dim) or a loose connection to the pump.

reelop19 · 06-14-2008, 8:04 AM

OK I've been testing wires and here's what I have. I'm getting power to the fuel pump so the manual says I should change the pump. It used to work however so I started testing other things and found that the fuel pump relay does not have continuity in the brown/black wire with the switch on, which suggests an open circuit but I can't find one. I know this is going to be something simple but I can't find it so far.

Chum · 06-14-2008, 12:30 PM

Either way, I hope you can get it figured out without having to purchase anything. Good Luck.
"BTW, the sensor is located directly under the battery on a flap that you can see from the rear of the bike. Its a square box with two bolts coming through that flap and has a little green connector."
This was already covered N3D. Read the whole post.

N3D · 06-14-2008, 12:40 PM

Quote:

Originally Posted by Chum

The tip sensor is mounted to the forward most portion of the battery tray. Kinda on the bottom. If you unplug it for a a sec, it should reset. If I recal correctly, the connector housing is green.

This is why I posted, the things in red are words that make is sound like you are unsure as to what you are talking about. If I were looking for an answer and read this, I would think you are just guessing and that may or may not be it. I rather have a confident answer when I'm searching for stuff and just wanted to let the guy know for sure that was in fact what he was looking for.

Whats highlighted in Blue is incorrect as you do not have to reset the sensor, but the sensor does have to be plugged in for the bike to run.

Chum · 06-14-2008, 12:52 PM

Quote:

Originally Posted by N3D

This is why I posted, the things in red are words that make is sound like you are unsure as to what you are talking about. If I were looking for an answer and read this, I would think you are just guessing and that may or may not be it. I rather have a confident answer when I'm searching for stuff and just wanted to let the guy know for sure that was in fact what he was looking for.

Whats highlighted in Blue is incorrect as you do not have to reset the sensor, but the sensor does have to be plugged in for the bike to run.

Do you understand the nature of my original post? It was a "hey, try this before you spend money" attempt to help. I in no way suggested it was the solution. I even started with a "I'm no pro" preface. I'm not offering paid services here, I just wanted to help the guy out with a problem I had before. Perhaps its not identical, but it sounds a lot like the problem. Hence the reason I made sure I couldnt be quoted on anything I suggested. ie - kinda, if I recall, it sounds like, and so on.
Your little "BTW" trip suggested I misinformed him of the location af the sensor. Let me re-read it and see if there is any more info in your post than I originally posted. Hmmm... green connector, under battery, two bolts. Sounds like you nailed it. Sure glad you took the time to clear things up.

N3D · 06-14-2008, 1:02 PM

Quote:

Originally Posted by Chum

Do you understand the nature of my original post? It was a "hey, try this before you spend money" attempt to help. I in no way suggested it was the solution. I even started with a "I'm no pro" preface. I'm not offering paid services here, I just wanted to help the guy out with a problem I had before. Perhaps its not identical, but it sounds a lot like the problem. Hence the reason I made sure I couldnt be quoted on anything I suggested. ie - kinda, if I recall, it sounds like, and so on.
Your little "BTW" trip suggested I misinformed him of the location af the sensor. Let me re-read it and see if there is any more info in your post than I originally posted. Hmmm... green connector, under battery, two bolts. Sounds like you nailed it. Sure glad you took the time to clear things up.

I got that, but im not going to argue with you about it. Its my post, if I want to be redundant I will be. I just wanted to reassure the guy that you knew what you was "kinda" talking about from the way I "recall" reading your post. So, let it go and don't hi-jack.

Chum · 06-14-2008, 1:05 PM

Yes Sir. Right away Sir.

reelop19 · 06-15-2008, 9:32 PM

Not only does my fuel pump not prime, none of my relays click either like they do when you turn the bike switch to on. The real question here is what would cause that? My battery is good so what main component is all ****ed up?

jkobflys · 06-16-2008, 12:53 AM

check the kill switch relay, how? i dont exactly know.
i had the same problem, checked everything i could, with no luck.
i took the bike to a profesional and $104.00 later ended up with a new ignition switch, and a running bike.
the only diference is that everyting else worked fine but the fuel pump.
take it to a shop.

reelop19 · 06-16-2008, 10:44 PM

Thanks for the help guys but I finally figured it out.....I put the Bank Angle Sensor in upside down. What a retard I am!

Chum · 06-16-2008, 11:05 PM

Awsome. I'm glad you got it figured out.

rokitt51 · 06-17-2008, 12:48 AM

Quote:

Originally Posted by N3D

I got that, but im not going to argue with you about it. Its my post, if I want to be redundant I will be. I just wanted to reassure the guy that you knew what you was "kinda" talking about from the way I "recall" reading your post. So, let it go and don't hi-jack.

Quote:

Originally Posted by Chum

Yes Sir. Right away Sir.

lost_in_oman · 06-21-2008, 12:05 PM

is the "BANK ANGLE SENSOR" and "TILT" sensor that people were refering to in this post the same thing?

N3D · 06-21-2008, 12:09 PM

Quote:

Originally Posted by lost_in_oman

is the "BANK ANGLE SENSOR" and "TILT" sensor that people were refering to in this post the same thing?

Well I'm not a bike mechanic but on cars bank refers to like a side of the engine. Say if it was a V-6 it has two banks, sometimes its also used for each cylinder. I don't think the two things you listed are the same thing.

jkobflys · 06-21-2008, 12:28 PM

the "bank angle sensor", "tilt switch" are the same thing its located behind the rear shock attached to the abs plastic undertail, its there to kill the bikes fuel pump and ignition in case the bike flips over and in case of a crash, it sences lean angle and when it gets to a certain point (usualy when you are on the floor) it cuts all the fuel related electronics.
glad to hear you got it sorted out.

lost_in_oman · 06-21-2008, 12:50 PM

Mine is not sorted.. I started another post (SP-2/RC51 won't start) and hoping this is my problem... Will be checking tomorrow....