fuel pump problems


Information and questions on GL1500 Goldwings (1988-2000)
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AlsGoldWing
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Location: Milton, Fl
Motorcycle: 82 GL 1100 Interstate 221,880k Sold
84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

fuel pump problems

Postby AlsGoldWing » Tue Aug 11, 2015 4:50 pm



Hi guys, been a member for a while with no posts. sorry about that. i have a 94 1500 aspencade with a fuel pump problem. Honda won't help me because of the age over 10 years old. I have read the service manuals on it with no results I am fixing to get a new fuel pump aftermarket, my problem is voltage. My battery is 12.7 volts and when i turn on the key with the lights on and hit the starter button and the voltage going through all the passages it needs to go to and ends up at the fuel pump connector, Should the voltage drop to 9.4



rayfie
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Re: fuel pump problems

Postby rayfie » Tue Aug 11, 2015 5:05 pm

Well be for you get a new fuel pump try you lean tilt sensor it under you seat you can make a by pass it shut down the pump when it Bad.

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spiralout
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Re: fuel pump problems

Postby spiralout » Tue Aug 11, 2015 8:48 pm

I'm going to let someone who understands that dark sorcery called electricity answer but I just wanted to say what the heck took you 6 years to make a post!!?? :lol: :lol:
I grew up in Navarre, right down the road and lived in Milton for a while. I still ride hwy 90 then down 87 when I go back to visit.

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virgilmobile
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Re: fuel pump problems

Postby virgilmobile » Wed Aug 12, 2015 7:06 am

The ECM powers the fuel pump,Go to it and check to see if it maintains proper power from the switched ignition.
A significant voltage drop can be located by following it to the source.
Kill switch,relay,fuse holder,etc,
Get the schematic,

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AlsGoldWing
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Motorcycle: 82 GL 1100 Interstate 221,880k Sold
84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Wed Aug 12, 2015 8:05 am

spiralout wrote:I'm going to let someone who understands that dark sorcery called electricity answer but I just wanted to say what the heck took you 6 years to make a post!!?? :lol: :lol:
I grew up in Navarre, right down the road and lived in Milton for a while. I still ride hwy 90 then down 87 when I go back to visit.


Well when i signed up i had a 82 GL1100, and was serfing the web and found this place, my 82 was a faithful ole girl i spent more time riding and never gave me any trouble and forgot about this place. Well i sold the 82 wing 2 weeks ago with 221,880 miles ( and miss it real bad ) on it and turned around and bought this 94 1500 aspecade with 74k it has been sitting a few years. And basic knowlege and some what common sense found what the problem is, fixing to install the 3rd fuel pump with no riding time there is something wrong. I tried 2 of the aftermarket fuel pump airtex now i am gonna try Delphi and see

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baumedagn
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GL1800HPNM

Re: fuel pump problems

Postby baumedagn » Wed Aug 12, 2015 9:03 am

What kind of voltage reading are you getting at the battery when you try to start? I know the 1500 is a power hungry beast.

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AlsGoldWing
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Motorcycle: 82 GL 1100 Interstate 221,880k Sold
84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Wed Aug 12, 2015 9:59 am

baumedagn wrote:What kind of voltage reading are you getting at the battery when you try to start? I know the 1500 is a power hungry beast.


The battery voltage was 12.7 and when i hit the starter button to send power to the fuel pump it was 9.4. Now i have my battery on charge all night don't know the stats this morning waiting for the new fuel pump to come in and i will let you know the results of a fully charged battery

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baumedagn
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Re: fuel pump problems

Postby baumedagn » Wed Aug 12, 2015 11:16 am

I think you may have a battery issue. If you haven't access to a load tester, take the battery to any auto parts store and have it load tested. I think you'll find it's failing under a load.

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AlsGoldWing
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84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Mon Aug 17, 2015 9:48 am

I was finally able to get back on the 1500. I removed all the fuel from the tank and put ethenol free fuel in it and installed the new delphi fuel pump with a 90 degree brass fitting to make sure of no kinks. I used my vaccume pump to open the petcock, then i used a jump wire to run the fuel pump to fill the carbs. My battery voltage is 12.57 volts I took my multi meter and put it on the fuel pump terminal turned on the key and hit the starter button and it cranked instantly the fuel pump is running at 11.36 volts the differnce in voltage is 1.21 volts. Would that be a problem on the pump with that voltage?

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virgilmobile
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Re: fuel pump problems

Postby virgilmobile » Mon Aug 17, 2015 11:46 am

So early on you had a 3.3 volt drop and now a 1.2 volt drop,correct?
A drop of 1.2 volts between the battery post and fuel pump connection is a bit higher than I'd expect.Personally I'd like to see it 0.6 or less.
This change from 3.3 to 1.2 is interesting.
What made the change and if nothing was done,will it happen again.?
Is there a failing connection?
Example...the kill switch contacts are contaminated...sometimes they pass power pretty good,next day...not so great...

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AlsGoldWing
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Motorcycle: 82 GL 1100 Interstate 221,880k Sold
84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Mon Aug 17, 2015 2:22 pm

virgilmobile wrote:So early on you had a 3.3 volt drop and now a 1.2 volt drop,correct?
A drop of 1.2 volts between the battery post and fuel pump connection is a bit higher than I'd expect.Personally I'd like to see it 0.6 or less.
This change from 3.3 to 1.2 is interesting.
What made the change and if nothing was done,will it happen again.?
Is there a failing connection?
Example...the kill switch contacts are contaminated...sometimes they pass power pretty good,next day...not so great...

Not Sure why the difference in voltage unless it was when i unplugged the ecm to look at the connections and when i plugged it back in it made a better connection. The bike did set out in the weather. I think i need to look at it closer, is there anything else to look at that is in conjunction with the fuel pump to help with voltage

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virgilmobile
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84 GL 1200 I

Re: fuel pump problems

Postby virgilmobile » Mon Aug 17, 2015 2:57 pm

I'll dig into the schematic and identify any other points of contacts..in the mean time,if you have the time,Attach your DVM positive lead to the battery positive post and the negative lead to the fuel pump terminal.Start the bike and take a accurate voltage drop reading.It can be anywhere from 0.0 to 3.5 volts.Less than 0.6 is good.
Shut off the bike...operate the ignition switch a few times on and off and retest.See if it changes.
Do the same test but operate the kill switch off and on a few times.
If a switch has burnt/corroded contacts...operating them a few times can improve the connection for a short time.
Take note if either switch has a effect on the voltage drop.
Its important to leave the meter hooked up as I described.
We're trying to locate the small drop in voltage.

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virgilmobile
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84 GL 1200 I

Re: fuel pump problems

Postby virgilmobile » Mon Aug 17, 2015 3:20 pm

OK...2 other points of current flow...Relay #6 and fuse #11.
One by one test each part and look for a change in the voltage drop...The relay can be swapped with another one near it..The fuse should be removed and inspected for connection corrosion..
That's about the complete voltage path after the main fuse..the 30 amp one attached to the start solenoid...
It feeds the ignition switch on a red wire....I suppose if it's the "dog bone" type still in there,you may want to remove it and replace it with the spare..They do crack...

That's the solenoid on the right side of the battery...The fuse is hidden under a plastic cover.

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AlsGoldWing
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Motorcycle: 82 GL 1100 Interstate 221,880k Sold
84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Wed Aug 19, 2015 1:01 pm

virgilmobile wrote:OK...2 other points of current flow...Relay #6 and fuse #11.
One by one test each part and look for a change in the voltage drop...The relay can be swapped with another one near it..The fuse should be removed and inspected for connection corrosion..
That's about the complete voltage path after the main fuse..the 30 amp one attached to the start solenoid...
It feeds the ignition switch on a red wire....I suppose if it's the "dog bone" type still in there,you may want to remove it and replace it with the spare..They do cracck...

That's the solenoid on the right side of the battery...The fuse is hidden under a plastic cover.


Ok hook the multimeter up negative to the fuel pump positive to the battery positive the meter read 2.13 checked all the fuses and relays and see no signs of corrosion, I worked the key switch several times and sprayed electrical contact cleaner in the on/off and the starter switch

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virgilmobile
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Re: fuel pump problems

Postby virgilmobile » Wed Aug 19, 2015 1:55 pm

Did the voltage drop change at all?
Even the kill switch.(not push button switch)

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AlsGoldWing
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84 GL 1200 Aspencade 60k Sold
94 GL 1500 Aspencade

Re: fuel pump problems

Postby AlsGoldWing » Wed Aug 19, 2015 9:01 pm

virgilmobile wrote:Did the voltage drop change at all?
Even the kill switch.(not push button switch)

I only checked with the engine running but i did notice that the only way i could get an accurate reading was on the battery lugs the terminals connecting to the wires on the battery were not good so my next project is to change the terminals. It appears there is corrosion running inside the wire insulation. i just hope there is enough wire to replace the terminals

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: fuel pump problems

Postby virgilmobile » Wed Aug 19, 2015 9:19 pm

Ok.Keep at it.
You will only be able to measure the voltage drop while the bike is running as it's the only time the fuel pump has power.
It's my intention to keep after this until were satisfied the problem is cured.
I'm most concerned that if left the way it is,the low voltage feeding the pump may cause a failiture in the future.
Just like you had previously.
Don't worry tho.If all else fails I have a way to power that pump direct from the battery under ECM control.
However I'd rather find a problem first and fix it.




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