BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down    Fuel Injection system refresh on Tue Jul 26, 2016 9:04 pm

Roland5

avatar
active member
active member
I had a very sub-optimal fuel line hemorrhage and I thought I would do a refurb of the exterior fuel lines as well as the manifold and up. The fuel system was emptied and now, with it all back together, the bike isn't firing up. The engine turns over and will "run" with starting fluid. I can hear the fuel pump working (but it does sound a bit sluggish). Before I start looking into the tank items, I'm wondering if anyone has any idea or experience with refilling and repressurizing the system. When the system is emptied, how long does it take with normal "push the button" starting to refill and repressurize the system? Just a minute? A few tries? Or does it take "a long dang time and you'll think you're going to have to look into the tank items because something is wrong, but it will work." (That last one is where I'm at now...) I've tried to start the bike and I don't want to damage the starter by continuing to try. The battery is fully charged. The last step is to pull the internals, replace the filter and check the pump. Before I do that, I was hoping to tap the experience here. Thanks for any an all advice.


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

2Back to top Go down    Re: Fuel Injection system refresh on Tue Jul 26, 2016 9:07 pm

duck

avatar
Life time member
Life time member
Shouldn't take too much. A few tries.

Top off your battery with a charge first so you don't fry the starter relay.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Fuel Injection system refresh on Tue Jul 26, 2016 9:07 pm

Dai

avatar
Life time member
Life time member
Check you haven't put the fuel lines on the wrong way round. If you're sitting on the bike, the line on the front of the fuel rail goes to the rear spigot on the fuel tank. If you're looking at the bike from the left (fuel rail) side, the line on left side of the fuel rail goes to the right hand spigot on the fuel tank.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

4Back to top Go down    Fuel system on Tue Jul 26, 2016 9:18 pm

Roland5

avatar
active member
active member
Thanks for the replies.

The battery is fully charged and currently on a battery tender.

The mixed up lines is a great place to start, but unfortunately(?) they're on correctly. Looking at the bike from the fuel rail side, front of the fuel rail to the rear spigot. From the fuel pressure regulator (top hose) to the front spigot.

If it should just take a few tries, it sounds like I'm going to be digging into the fuel tank items. I'll pull the fuel pump and change the filter. I'm actually running the mustang fuel pump in there and have been for many years... it may need a lift, clean, replace.

Thanks for the assist. Any other suggestions would be welcomed.


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

5Back to top Go down    Re: Fuel Injection system refresh on Tue Jul 26, 2016 9:28 pm

RicK G

avatar
VIP
VIP
Did you check to see if any bits from the previous hose are inhabiting the fuel rail or FPR. The pump, from your description, seems to be pumping into a blockage


__________________________________________________
If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

6Back to top Go down    Re: Fuel Injection system refresh on Tue Jul 26, 2016 9:34 pm

Roland5

avatar
active member
active member
The fuel rail was cleaned, I didn't check the FPR. I have a feeling the fuel filter is gummed up. I have a spare fuel filter and will stick that in there when I do a cleaning on the fuel pump. I didn't notice any bits floating about but it's never just one problem with my stuff. There's always something extra hiding in the shadows... Thank you again for your reply.


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

7Back to top Go down    Re: Fuel Injection system refresh on Wed Jul 27, 2016 5:27 am

WoodyAUK75

avatar
Silver member
Silver member
I put mine all back together on the weekend, and I was at the stage where I thought I was going to have to roll start it down the hill, when it started and has been fine ever since. I changed all the fuel lines, so it must have just taken a while to pressure up.

    

8Back to top Go down    Re: Fuel Injection system refresh on Wed Jul 27, 2016 7:18 am

duck

avatar
Life time member
Life time member
Easy test: Undo the bottom of the fuel line that goes from the tank to the fuel rail. Put a bucket under it. Hit the start button to see if any fuel comes out.

(Avoid open flames while conducting this procedure.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

9Back to top Go down    Re: Fuel Injection system refresh on Wed Jul 27, 2016 12:15 pm

Roland5

avatar
active member
active member
WoodyAUK75 wrote:I put mine all back together on the weekend, and I was at the stage where I thought I was going to have to roll start it down the hill, when it started and has been fine ever since. I changed all the fuel lines, so it must have just taken a while to pressure up.

So how long did it take to get it going? I've been trying sparingly because I don't want to burn up my starter or weld the relay ... I'm going to try it a few more times and then wade headlong into the gas tank bits. Thanks for the reply!


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

10Back to top Go down    Re: Fuel Injection system refresh on Wed Jul 27, 2016 12:17 pm

Roland5

avatar
active member
active member
duck wrote:Easy test: Undo the bottom of the fuel line that goes from the tank to the fuel rail. Put a bucket under it. Hit the start button to see if any fuel comes out.

(Avoid open flames while conducting this procedure.)

Thanks duck. I'll give that a try. I just put oetiker clamps on there but I believe I've got a few extra.


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

11Back to top Go down    Re: Fuel Injection system refresh on Thu Jul 28, 2016 4:44 am

WoodyAUK75

avatar
Silver member
Silver member
It flattened the battery and I had to use a jump pack.

    

12Back to top Go down    Re: Fuel Injection system refresh on Thu Jul 28, 2016 8:43 am

duck

avatar
Life time member
Life time member
Roland5 wrote:
duck wrote:Easy test: Undo the bottom of the fuel line that goes from the tank to the fuel rail. Put a bucket under it. Hit the start button to see if any fuel comes out.

(Avoid open flames while conducting this procedure.)

Thanks duck. I'll give that a try. I just put oetiker clamps on there but I believe I've got a few extra.

Ditch the Oetiker clamps. I get rid of them on all of my Ks.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

13Back to top Go down    Re: Fuel Injection system refresh on Mon Aug 08, 2016 10:16 pm

Roland5

avatar
active member
active member
Just wanted to update this thread with a final entry. After removing/checking reinstalling the (mustang) fuel pump. Replacing the fuel filter. Checking flow at the rail. All normal. In my case the no start condition turned out to be my fuel injector harness connection under the tank. I had an issue with that connector before, where the connector looked fine but was separated slightly and created a run/no run condition that was very difficult to track down. Once the connector was secured the bike started right up.



Thanks for the assistance y'all
Roland


__________________________________________________
Roland Antumblen
85K100RT - BlacK Beem
Toad Suck, AR
    

14Back to top Go down    Re: Fuel Injection system refresh on Tue Aug 09, 2016 4:12 am

92KK 84WW Olaf


Life time member
Life time member
Excellent outcome. Nothing like the pleasure of a first ride after getting a job like that completed.

I was at mine at weekend, had to replace the fuel line from the fuel pressure regulator [FPR] to the rear of the fuel rail. Have had quite a few tank off no start events that I think it has to become a habit of open and remake all the connections when you are in there like that. I alsoslightly closed up the female connectorsin the fuel pump tank plug. But I still managed to get the no start after I didn't put that one back properly. Once it was back correctly it did fire first attempt so doesn't take long to get fuel flow back up to pressure.


__________________________________________________
1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 84,100 miles
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum