F4 wont start - MVAgusta.net
 4Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old 09-14-2017, 07:42 AM Thread Starter
New Member
 
Mixon's Avatar
 
Join Date: Apr 2014
Location: South Carolina
Posts: 64
F4 wont start

Hey guys,

I just finished rebuilding my 2008 F4 R312 after having it painted and she wont start. I've got spark, my new Shorai battery is fully charged, and the fuel pump primes correctly (starts, runs, then stops) but I don't think the fuel rail is being pressurized. I disconnected my fittings from the rail, cranked the engine a few times, but there was no fuel coming out. My fuel filter, in-tank lines, and outside lines are still pretty new since I replaced them at the beginning of this year. However, I just replaced my plastic female quick connects with metal ones to match my male quick connects (I was lazy and didn't feel like replacing both at the same time). The quick connects were sourced from Alex at GP so they're not the Chinese knockoffs. I'm gonna do some fuel flow tests after work today since I ran out of energy last night.

During assembly I accidentally plugged the 2 bottom left connectors in backwards. I think they're the side stand switch and speed sensor connections. I roasted the A1 fuse (first fuse on the left) a few times trying to find my mistake. The rest of my fuses look good including the ones on the starter relay. Is there a diode somewhere I may have burned out?

I'd appreciate any advice you may have since I have a race this Sunday

Thanks guys,
Chris
Attached Images
 

.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mixon is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old 09-14-2017, 09:25 AM
Senior Member
 
number2's Avatar
 
Join Date: Jan 2009
Location: Charleston South Carolina
Posts: 5,540
You probably need to start from scratch with the fuel tank and pump. Make sure all of the lines are on the pump. I don't know if there are improper fuel fittings but I would check those to insure you have the proper ones. If you disconnect the fittings from the bottom of the tank and no gas comes out of the lines then the gas is not coming out of the pump
number2 is offline  
post #3 of 14 (permalink) Old 09-14-2017, 09:53 AM Thread Starter
New Member
 
Mixon's Avatar
 
Join Date: Apr 2014
Location: South Carolina
Posts: 64
I pulled the base plate last night and everything looked in order. I'm gonna test the fuel pump, fittings, and hoses today. I'll let you know what I find.

If anyone has made the mistake of plugging those 2 connections in backwards please chime in. I knew there was problem because my dash died after turning the ignition on. I really hope I didn't fry something other than the fuse...

.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mixon is offline  
Sponsored Links
Advertisement
 
post #4 of 14 (permalink) Old 09-14-2017, 10:15 AM
Senior Member
 
gotojoe's Avatar
 
Join Date: Nov 2009
Location: Bellanagare, West Ireland 44 7875 299281
Posts: 9,930
There is a diode down in the wires by the starter solenoid connector block. It's a 10c part and they will pop if for instance the battery is connected the wrong way around...

If you disconnect your fuel lines from the fuel rail then try to start, no fuel will emerge..The male connects are a stop valve when disconnected.

I suspect your problem is electrical as are 99 % of fuel problems : )

Best of luck.

Joe
gotojoe is offline  
post #5 of 14 (permalink) Old 09-14-2017, 10:23 AM
Senior Member
 
silentservice703's Avatar
 
Join Date: Feb 2008
Location: Duxbury, MA, USA
Posts: 20,823
Send a message via Skype™ to silentservice703
On the disconnects: there are differing lengths of protrusions that disable the check function. If your male ends are not compatible with your female ends, then the fuel will not flow.

Were I zany enough to try this, I would disconnect the return line from the rail to the tank, turn on the pump so it primes, then, while aiming the male end of the return hose at a bucket or suitable container, I would actuate the sleeve by pressing in and see if fuel flows. If it does, it will flow ALOT!!!!

Gapalicious 2019 at
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
from OCTOBER 2-6, 2019

Call (423) 519-2000 or (423) 253-6213 to reserve your Riverfront Cabin. PM me for The Crow's Nest reservation!!!

Email/Paypal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My personal Cell Phone: (781) 223-3020


'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
silentservice703 is offline  
post #6 of 14 (permalink) Old 09-14-2017, 10:24 AM
Senior Member
 
silentservice703's Avatar
 
Join Date: Feb 2008
Location: Duxbury, MA, USA
Posts: 20,823
Send a message via Skype™ to silentservice703
Joe, do the John Guest fittings act as checks when disconnected?
gotojoe and gotojoe like this.

Gapalicious 2019 at
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
from OCTOBER 2-6, 2019

Call (423) 519-2000 or (423) 253-6213 to reserve your Riverfront Cabin. PM me for The Crow's Nest reservation!!!

Email/Paypal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My personal Cell Phone: (781) 223-3020


'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
silentservice703 is offline  
post #7 of 14 (permalink) Old 09-14-2017, 11:18 AM Thread Starter
New Member
 
Mixon's Avatar
 
Join Date: Apr 2014
Location: South Carolina
Posts: 64
Quote:
Originally Posted by gotojoe View Post
There is a diode down in the wires by the starter solenoid connector block. It's a 10c part and they will pop if for instance the battery is connected the wrong way around...

If you disconnect your fuel lines from the fuel rail then try to start, no fuel will emerge..The male connects are a stop valve when disconnected.

I suspect your problem is electrical as are 99 % of fuel problems : )

Best of luck.

Joe
Thanks Joe! I'll check that diode tonight

Quote:
Originally Posted by silentservice703 View Post
On the disconnects: there are differing lengths of protrusions that disable the check function. If your male ends are not compatible with your female ends, then the fuel will not flow.

Were I zany enough to try this, I would disconnect the return line from the rail to the tank, turn on the pump so it primes, then, while aiming the male end of the return hose at a bucket or suitable container, I would actuate the sleeve by pressing in and see if fuel flows. If it does, it will flow ALOT!!!!
Quote:
Originally Posted by silentservice703 View Post
Joe, do the John Guest fittings act as checks when disconnected?
I bought the disconnects as a mated pair, so I hope they're the proper size. I'll check them regardless.

So I disconnected the john guest feed fitting from the rail and then primed the pump expecting fuel to shoot out. I even thumbed the starter switch. No juice. I didn't think those fittings had check valves
gotojoe and gotojoe like this.

.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mixon is offline  
post #8 of 14 (permalink) Old 09-14-2017, 11:41 AM
Senior Member
 
silentservice703's Avatar
 
Join Date: Feb 2008
Location: Duxbury, MA, USA
Posts: 20,823
Send a message via Skype™ to silentservice703
Are you certain you got the supply fitting?

Gapalicious 2019 at
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
from OCTOBER 2-6, 2019

Call (423) 519-2000 or (423) 253-6213 to reserve your Riverfront Cabin. PM me for The Crow's Nest reservation!!!

Email/Paypal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My personal Cell Phone: (781) 223-3020


'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
silentservice703 is offline  
post #9 of 14 (permalink) Old 09-14-2017, 12:10 PM
Senior Member
 
gotojoe's Avatar
 
Join Date: Nov 2009
Location: Bellanagare, West Ireland 44 7875 299281
Posts: 9,930
Quote:
Originally Posted by silentservice703 View Post
Joe, do the John Guest fittings act as checks when disconnected?
Excellent point there Chuck !

No they definitely don't ! I just added a line or two to my post back there. Sorry to confuse...If you leave your fuel lines connected to the base plate then disconnect from the fuel rail you will find a very positive fuel flow once the the ignition is switched on and the pump primes.

Sorry I confused matters. I've amended my earlier post !

Joe
gotojoe is offline  
post #10 of 14 (permalink) Old 09-14-2017, 12:17 PM
Senior Member
 
silentservice703's Avatar
 
Join Date: Feb 2008
Location: Duxbury, MA, USA
Posts: 20,823
Send a message via Skype™ to silentservice703
Looking at the wiring diagram, the starter solenoid diode is not shown. I believe it to be there, but it is not on the diagram.

As to the point of reversing the side stand switch connector, it does look like it reverses polarity through a convoluted route and may be the culprit.

Check the diode.

Gapalicious 2019 at
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
from OCTOBER 2-6, 2019

Call (423) 519-2000 or (423) 253-6213 to reserve your Riverfront Cabin. PM me for The Crow's Nest reservation!!!

Email/Paypal:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My personal Cell Phone: (781) 223-3020


'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125
silentservice703 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to use all of the features of the MVAgusta.net site, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome