6th gen fuel pump issue

I hope you guys can help trouble shoot my fuel pump problem. Yesterday, I was leaving the motorcycle shope where I work sometimes, I got 50 feet and my 07 VFR800 died. She wouldn't start again. Battery is fine, engine turns but it won't start. When I turn the key, the fuel pump does not come on, so... Logically, its an issue with the fuel pump. Thankfully it happened at the shop and one of the guys ran some diagnostics on the fuel pump and relay. Doesn't seem to be either of those. Some other things that "may" be related....

1. For the past two summers it seems that the heat has caused some very intermittent "chugging" and surging, but it has only happened a few times each summer and I ride pretty much every day... So I figured they were flukes.

2. In November 2012, she died while I was out in CA and I replaced the stator. The mechanic there showed me where some wires were burned and suggested replacing them. I was able to ride the bike back home and even do a track day, until she died on the track. I replaced the wiring harness with the VFRness.

3. Just a couple weeks ago I experienced the chug and surge but this typically lasts just a couple seconds and its done.

I am supposed to be heading out on a Pacific NW road trip next Thursday so I'm hoping to get this fixed so I can still do this. I trust the guys at my shop but I also know that these bikes can sometimes have some weird things going on, especially when it comes to electrical. Thank you in advance for any thoughts you guys have and sharing your own experiences. It may help us get this figured out sooner than later.

 

Hi Chicky

Sorry its probably a bit late - I saw this post a few days ago whilst I was away touring in the UK and assumed you would have had plenty of responses by now.

Anyway you may want to look at this pictorial wiring diagram.

http://www.lifford-cooke.com/motorbiking/documents/VFR VTEC PGM-FI Diagram 2002.pdf

As you can see there are quite a few interlinked components which could result in the fuel pump not receiving power. I would be tempted to work backwards from the pump and check for volts reaching the pump? If there is no power work progressively backwards down the digram to identify the fault.

As for possible culprits - I recall seeing a post on another forum which was eventually traced to an intermittent issue with the tip over sensor triggering the fuel cut off relay. If your bike is fitted with HISS, then I guess a failure to recognise the key might cause the starter to turn but preventing it firing up by denying power to the fuel pump. If so try using the spare key - if the bike runs OK with the other key, it might show the transponder chip in one key is dead.

Hope you get it fixed.




SkiMad

 

Thank you for taking the time to reply and providing some great info SkiMad!! It was just between today and yesterday that we "think" we may have it solved. It kept blowing out the fuse in the VFRness, so I contacted the guy who makes them. He said he has seen this a couple times and, while he provides 20 amp fuses and the bike should, and most of the time does, work with the 20 amp fuse, some bikes need a 30 amp fuse. So far with a 30 amp fuse it is working just fine. Not sure if this is just masking a larger issue but we shall see I guess... Once I get her back and start riding regularly again, I will post up if more issues are found.

 

Wow, I just looked at the wiring diagram you sent.... Much better in some respects than anything I've seen here. I'm holding onto this.... Thanks for sharing!!

 

I have had my bike behaving the same way for a few months and it turned oot to be a poor connection in the engine stop switch.

 

I just now found this thread..... :sad:
Kudo to all the above advise. Good luck Chicky keep us posted
And no I am not allow to ride yet

 

ive got my money on a bad main 30 amp fuse connection. replace the main 30 amp fuse holder with an inline marine grade 30 amp fuse holder.
the vfrness would not be blowing its fuse and even if it did, the bike would still be working, if the main 30 amp fuse holder was in good shape.