Author Topic: Fuel pump not engaging  (Read 208 times)

Offline DJW

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Fuel pump not engaging
« on: December 21, 2020, 07:57:53 PM »
After about three weeks in the bike shop, I have my bike back but still a no go.  I posted previously that it was a ECM issue but after having a loaner ecm delivered and tried the fuel pump still will not prime or engage when the ignition is on.  The bike will wind over but because the fuel pump is not priming, the bike wont start.  I am told that they have examined and tried every possible electrical diagnostic that they can think of and with advice from Honda.  All fuses, relays, connections, switches etc have been checked I am told.  The fuel pump was bridged and proven to work i am told, however once plugged back in to the wiring loom, its a no go.
So, the result is I have a bike that the fuel pump will not engage when the ignition is on so therefore wont start.  Any ideas from the brains trust????
 

Offline Jdbiker

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Re: Fuel pump not engaging
« Reply #1 on: December 21, 2020, 11:32:01 PM »
Good thing you didnít invest in a new ECM just to find that wasnít the issue. I still think itís a faulty connection or damaged wiring. Do you have a wiring diagram? Trace back wiring from fuel pump. Might have been able to help if you were in Melb.
Good luck 👍
Jdbiker.
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Offline StinkyPete

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Re: Fuel pump not engaging
« Reply #2 on: December 22, 2020, 05:35:41 AM »
My first check wouild be for voltage at the fuel pump wiring connections, but I would assume that's been done.
Do you have enough faith in your mechanic that they have properly investigated the issue, and not just said that they have?
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Offline Jdbiker

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Re: Fuel pump not engaging
« Reply #3 on: December 22, 2020, 06:51:55 AM »
If ECM has been eliminated as the problem, other things to check are ,

Fuel cut off relay
Engine stop relay
Engine stop switch
Lean angle sensor

Jdbiker.
2008 red ST1300A
1980 Yamaha XS 1100
1974. Yamaha TX 500
1984   Kawasaki GT 750
1975  Honda GL1000
Honda XL 250
Suzuki TS 100
2000 Honda ST1100P
1988 Enfield Bullet 350
 

Online West Aussie Glen

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Re: Fuel pump not engaging
« Reply #4 on: December 22, 2020, 09:41:03 AM »
It may be worthwhile reading this thread:-

http://ozstoc.com/index.php?topic=13796.msg1265480#msg1265480

As well as some strange systems the fuel pump didn't start.
Glen
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Offline DJW

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Re: Fuel pump not engaging
« Reply #5 on: January 02, 2021, 09:16:34 AM »
So, I have this week off.  All plastic comes off today to get in and around the bike.  Also forgot to mention that the battery is cactus, but I would have to assume that the bike shop used a good battery, not my crappy one that wont hold charge.  Off to get a new battery this morning and a trickle charger.
I am not a mechanic by any stretch, but I have a basic understanding if a wire is getting power or an earth is dodgy.  I know that the bike shop has said they checked everything they can, but my brain tells me to have a crack myself.  I have printed of the topics re the various suggestions and I guess its now a matter of trial and error to see if I can get the fuel pump to prime. If I cannot figure this out there may be a cheap ST1300 on the market at weeks end.
 
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Offline ST2UP

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Re: Fuel pump not engaging
« Reply #6 on: January 03, 2021, 11:52:51 AM »
So, I have this week off.  All plastic comes off today to get in and around the bike.  Also forgot to mention that the battery is cactus, but I would have to assume that the bike shop used a good battery, not my crappy one that wont hold charge.  Off to get a new battery this morning and a trickle charger.
I am not a mechanic by any stretch, but I have a basic understanding if a wire is getting power or an earth is dodgy.  I know that the bike shop has said they checked everything they can, but my brain tells me to have a crack myself.  I have printed of the topics re the various suggestions and I guess its now a matter of trial and error to see if I can get the fuel pump to prime. If I cannot figure this out there may be a cheap ST1300 on the market at weeks end.

Iím reasonably sure it will be a shorted wire in the loom that zigzags around under the seat.

I know this because it happened to me exactly as you have described  ;-*

Iím sure I put a thread with the fix here on the forum.....all I did was ID the problem but not the exact location of the issue as it occurred in the loom over a wire distance of about 2 metres.

My fix was to use a water proof fuse holder from the Fuel relay to the pump and install a 20amp fuse, this way if I get so inclined one day I can pull the fuse and replicate the issue to repair. I can almost guarantee I will never have the time.....this has worked for last 4 yrs without issue.

Cheers
Chris    



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Offline DJW

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Re: Fuel pump not engaging
« Reply #7 on: January 03, 2021, 01:04:03 PM »
Hi, there are 3 wires of the pump, two brown and a green.  Which wire did you connect straight to the fuel relay and what position on the relay please

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Offline PC

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Re: Fuel pump not engaging
« Reply #8 on: January 03, 2021, 02:29:54 PM »
http://ozstoc.com/index.php?topic=8672.msg102276#new
If I have done it Wright try this link
 
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