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Old 02-15-2015, 08:17 AM   #1
drwet OP
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950 Fuel pump failure?

My winter project has been removing the engine from my 2004 950. Broken shift drum last Fall. Pulled the engine and had the dealer change the drum, rebuild the water pump and a few other upgrades. Last week I got the engine back in and went to fire up the bike. Two problems. The neutral switch is out of adjustment, but the dealer says that's the result of the new drum and an easy fix that they will take care of for me. The other and bigger problem is the engine doesn't want to run. As long as the enrichener (choke) is on, it will idle, but it won't accept any throttle and it quits as soon as I try to reduce the enrichener. It behaves as if it has a major vacuum leak or a shortage of fuel. My first concern is that the fuel pump may have failed. For reasons that I won't go into, I energized the ignition before there was fuel in the tanks, and the fuel pump ran dry for a good 15-20 seconds. My concern is that I may have damaged the fuel pump by running it dry. Does this sound likely, and what is the best way to test the fuel pump? I'm also open to any other suggestions.
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Old 02-15-2015, 08:28 AM   #2
ManuC
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Maybe a leak on the carbs collards, for the pump it is not a problem to run it without fuel...
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Old 02-15-2015, 09:16 AM   #3
drwet OP
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Thanks. What is a carb collard?
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Old 02-15-2015, 09:25 AM   #4
Qwik
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I think he means the carb intake boots.
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Old 02-15-2015, 09:49 AM   #5
gefr
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Your problem sounds like poor mixture.

What they said.
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Old 02-15-2015, 10:11 AM   #6
ManuC
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Yes sorry for my englisch

http://www.cross-roads.fr/pieces_et_...ont-10699.html

Piece 21
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Old 02-15-2015, 12:11 PM   #7
Wizard
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Carb pilot jets plugged from sitting - remove carb float bowls and clean the jets.

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Old 02-15-2015, 02:01 PM   #8
Qwik
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Good point Wizard, my pilot jets were plugged from sitting when I had the motor out.
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Old 02-15-2015, 03:04 PM   #9
drwet OP
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Originally Posted by ManuC View Post
Don't apologize. I only speak one language. And by some reports, not very well.

I checked the intake boots. They are seated and tight.

I checked the fuel pump by disconnecting the output line and running a piece of hose from there to a gas can and turning on the key. The pump puts out a steady stream of fuel and runs for about 5 seconds and shuts off. I assume there is a circuit which supplies power to the pump once the engine starts, although I haven't checked the wiring diagram yet.

Next I pulled the top of the airbox off and tried starting it again. The rear cylinder is backfiring through the carb whenever I try to give it throttle. That says to me that the rear cylinder is running lean.

Is my logic sound, and any thoughts on why one carb would suddenly be lean? I am not looking forward to pulling the carbs off for a rebuild and I'd like to exhaust all the other possibilities first.

drwet screwed with this post 02-15-2015 at 03:05 PM Reason: Kant spel
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Old 02-15-2015, 03:55 PM   #10
Qwik
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Only one carb is blocked. Pull em and clean the pilot and main jets.
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Old 02-15-2015, 05:18 PM   #11
TheMuffinMan
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When the fuel line from the left tank to the pump was pinched on my old 950 mine would run for a little bit and then the front cylinder would start dying and missing. Check for kinked or pinched fuel lines too.
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Old 02-15-2015, 06:18 PM   #12
drwet OP
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When the fuel line from the left tank to the pump was pinched on my old 950 mine would run for a little bit and then the front cylinder would start dying and missing. Check for kinked or pinched fuel lines too.
Thanks. I've checked all the lines and the carb boots and everything else I can think of to make sure I've installed everything correctly. I'm beginning to think its got to be internal in the carbs and I'm going to have to bite the bullet and rebuild them. Just having difficulty accepting that as the bike ran perfectly when I took it apart.
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Old 02-15-2015, 06:23 PM   #13
Deadly99
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Quote:
Originally Posted by wizard View Post
carb pilot jets plugged from sitting - remove carb float bowls and clean the jets.

Jim
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Old 02-15-2015, 09:25 PM   #14
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^^^ That ^^^
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Old 02-15-2015, 10:48 PM   #15
gefr
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Maybe some carb cleaner could save your day?

These strong carb cleaners could help? insert some fuel additives maybe?
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