Repaced fuel pump, runs bad.


Information and questions on GL1500 Goldwings (1988-2000)
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steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Repaced fuel pump, runs bad.

Postby steve allen » Sat Jun 13, 2015 8:59 am



I just replaced fuel pump with aftermarket pump, but, found it was actually relay bad. Ok, I replaced relay, new fuel filter alone with fuel pump and now, bike runs rough at idle, idle is lower than before and I have to rev up to 2 grand or more to pull off from a stop or bike will die. And once I get rolling, if no load on throttle, sounds and feels like running on 5 cylinders instead of 6. Run great before it shut off and I replaced the parts I did......any ideas? I am so frustrated with it right now! Please help me. Thanks, Steve The bike seems to run alright at hiway speeds, but otherwise, something is not right.



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alwims
Posts: 126
Joined: Fri Feb 21, 2014 12:17 pm
Location: Wheatland, Mo, but living in Edinburg, Texas
Motorcycle: 1987 GL1200 Aspencade
2008 GL1800

Re: Repaced fuel pump, runs bad.

Postby alwims » Sat Jun 13, 2015 3:42 pm

You don't say what bike, but my first thought is you used a new pump with the wrong PSI rating.

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Sat Jun 13, 2015 4:38 pm

I have a 1994 GL1500SE and the aftermarket pump claims to be OE specs pressure and flow rate. The company is in California, the company is HighFlowFuel. Specs say is OE pressure and flow rate for Honda ST1100 and GL1500. I called tech and talked with them, sounds legit. I am just so baffled right now, fuel filter is staying full when running, sort of thought that would clear low pressure? Don't know?

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alwims
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Location: Wheatland, Mo, but living in Edinburg, Texas
Motorcycle: 1987 GL1200 Aspencade
2008 GL1800

Re: Repaced fuel pump, runs bad.

Postby alwims » Sat Jun 13, 2015 6:04 pm

Another thought. Did you install the fuel filter in the correct flow direction.

Big Bob
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Joined: Fri Feb 21, 2014 11:43 am
Location: Rosemount, Minnesota
Motorcycle: 1996 GL1500A Aspencade

Re: Repaced fuel pump, runs bad.

Postby Big Bob » Sat Jun 13, 2015 10:19 pm

Just a thought, but you could just flat out have a bad (new) pump, you just never know.

Bob
Bob Payette
Rosemount, MN
'96 GL1500A Aspencade, Red The Best Color!
143,000 miles and still going strong!
A bad day off is better than your best day at work!

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Sat Jun 13, 2015 11:56 pm

filter installed in correct direction, gonna test pressure, or, maybe reinstall old pump! Just got to figure were to get solvent proof wires since the old ones have been cut. The ones left on pump support will not reattach to pump. Must soldier new wires to pump that will hold up to being submersed in gas and attach to power and ground on top plate. Question? If pump pressure is not proper, why will bike run good at hiway speed and run rough at idle? Just can't seem to grasp the problem. Thanks, Steve

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alwims
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Location: Wheatland, Mo, but living in Edinburg, Texas
Motorcycle: 1987 GL1200 Aspencade
2008 GL1800

Re: Repaced fuel pump, runs bad.

Postby alwims » Sun Jun 14, 2015 7:49 am

Sorry but I'm out of idea's. Good luck. Wish I could help. I will add, the bad "new" pump scenario happened to me a while back on a 1000 mile trip to Kansas. Original pump went out on the way up, new pump went out on the way back home.

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MikeB
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Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Repaced fuel pump, runs bad.

Postby MikeB » Sun Jun 14, 2015 12:54 pm

steve allen wrote:Run great before it shut off and I replaced the parts I did......any ideas? I am so frustrated with it right now! Please help me. Thanks, Steve The bike seems to run alright at hiway speeds, but otherwise, something is not right.


If the bike did run great as you say it did, why did you replace the pump? No matter, if it were me, I would reinstall the original pump and give it a try.

If that is not an option or you want to continue troubleshooting, look at the components in the fuel line to the carbs. The fuel filter, and vacuum operated shot off come after the fuel pump right? Bypass them and then try running the engine.

If that doesn't give you the result you are looking for, do the fuel flow test outlined in the service manual. If that is all good, then you will need to start looking for vacuum leaks and possible fuel line or carburetor contamination from the work you did.
MikeB
Tacoma, WA, USA

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Sun Jun 14, 2015 4:57 pm

The bike shut off while riding, would not run, just spun over and over. Checked fuel pump, had voltage on ground and rear lead, assumed bad pump. Ordered pump, installed only to realize they are 2 leads and a ground attached to top, the one I checked goes to something mounted on pump holder half way down in tank. The one that did not have voltage was the pump hot lead and traced back to find bad relay. Now, when new pump arrived, I cut wires off close to pump and installed new pump. I have since checked old pump and found it good. Problem is trying to reattached wires, sealing them were they will work submersed in fuel. The wires have color insulation and under that is a silicone type covering that I can't find nothing like it at auto parts store. Don't want to soldier wire and use heat shrink only to find it didn't hold in fuel and set bomb off under my rear.

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Sun Jun 14, 2015 8:48 pm

Okay, I have another idea if any one has a clue....when I replaced new pump, I had the polarity pulling a vacuum instead of pressure, could this have messed up petcock diagram causing the bike to run rough until opened up?

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MikeB
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Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Repaced fuel pump, runs bad.

Postby MikeB » Sun Jun 14, 2015 9:08 pm

I still suggest that you bypass the filter and vacuum operated shut off valve and give it a try to eliminate them as a source of trouble. If it still runs poorly, it is not one of those components and you can most likely eliminate them as causing the problem.
MikeB
Tacoma, WA, USA

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Mon Jun 15, 2015 7:53 pm

Run fuel line straight from pump to line going to carbs, bypassing fuel filter and petcock, still runs the same. Got another fuel pump on the way from same source this one came from, still don't think It's the problem. Is it necessary to connect the return line inside tank? Every method of aftermarket shows no connection of return line and or says its not necessary. I am so baffled with the issue now. Some body please help me with something that I might have over-looked. Thanks, Steve

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gordonv
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Location: Richmond BC
Motorcycle: 1988 GL1500
1999 GL1500CF
1982 GL1100A

Re: Repaced fuel pump, runs bad.

Postby gordonv » Mon Jun 15, 2015 10:06 pm

I know on my Shadow there was a method to run the fuel pump and compare the volume of fuel discharged over a specific amount of time, to see if the pump is delivering the correct amount of fuel.

I see there is no reason why there shouldn't be the same for the GW.

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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Repaced fuel pump, runs bad.

Postby WingAdmin » Tue Jun 16, 2015 9:59 am

gordonv wrote:I know on my Shadow there was a method to run the fuel pump and compare the volume of fuel discharged over a specific amount of time, to see if the pump is delivering the correct amount of fuel.

I see there is no reason why there shouldn't be the same for the GW.


There absolutely is, and in fact, this is the method explained in the service manual to test the fuel pump operation.

Fuel Pump Operation Test
Remove the right fairing inner cover.
Turn the ignition switch OFF.
Disconnect the engine control module connector.
Short the BLKlWHT and BLK/BLU wire connector terminals with a jumper wire.


Disconnect the fuel pump outlet line at the fuel filter. Hold a graduated beaker under the tube.
• Keep gasoline away from flames or sparks. Wipe up spilled gasoline at once.
Turn the ignition switch ON, let fuel flow into the beaker for 5 seconds, then turn the ignition switch off.


Multiply the amount in the beaker by 12 to determine the fuel pump flow capacity per minute.
Fuel Pump Minimum Flow: 640 cc (21.6 oz)/minute

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MikeB
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Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Repaced fuel pump, runs bad.

Postby MikeB » Tue Jun 16, 2015 10:14 am

The OEM service manual is truly a valuable tool. It is just as important to own the manual as it is to own a set of metric tools.
If you're going to work on your own bike I think everyone would highly recommend that you own one and read it.
MikeB
Tacoma, WA, USA

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captdecker
Posts: 47
Joined: Wed Jun 12, 2013 12:39 am
Location: Prescott, Az
Motorcycle: 89 Gl1500
2006 GL1800HPN ABS

Re: Repaced fuel pump, runs bad.

Postby captdecker » Mon Jun 22, 2015 11:26 pm

as for to something mounted on pump holder half way down in tank is the low fuel level for the dash light.
I to am having trouble with my Gl1500. very much like you are...but only on the first stat of the day..then is fine.

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Repaced fuel pump, runs bad.

Postby steve allen » Tue Jun 23, 2015 5:50 am

captdecker wrote:as for to something mounted on pump holder half way down in tank is the low fuel level for the dash light.
I to am having trouble with my Gl1500. very much like you are...but only on the first stat of the day..then is fine.

As of yesterday, I had no other choice but place mine in Honda shop. I am glad to know what the other thing mounted on fuel pump is....sort of thought it would be mounted alone with fuel level assembly.

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captdecker
Posts: 47
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Location: Prescott, Az
Motorcycle: 89 Gl1500
2006 GL1800HPN ABS

Re: Repaced fuel pump, runs bad.

Postby captdecker » Tue Jun 23, 2015 6:29 am

good luck to you. Please let me know what they find. I going to try bypassing ( the book calls it auto fuel value) to see if it is sticking from sitting over night. mine once running good stays that way.




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