Electric vs mechanical fuel pump


Information and questions on GL1100 Goldwings (1980-1983)
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DocDan
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Joined: Fri Nov 13, 2015 10:46 am
Location: St. Louis, MO
Motorcycle: 1982 GL1100

Electric vs mechanical fuel pump

Post by DocDan »



I am a new owner of a 1982 GL1100. The previous owner had installed an electric fuel pump when the original failed. I am unfamiliar with doing this to an older bike. I think I would prefer to replace the original, but don't know if this would be "going backward." The bike currently has a power fall-off at 3500RPM, then picks back up at 5000ish. Do any of you think the constant flow of the electric pump could be at fault?


"To diagnose, one must observe and reason."
-Galen The Healer c. 163 AD
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WingAdmin
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1982 GL1100A Aspencade (sold)
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Re: Electric vs mechanical fuel pump

Post by WingAdmin »

DocDan wrote:I am a new owner of a 1982 GL1100. The previous owner had installed an electric fuel pump when the original failed. I am unfamiliar with doing this to an older bike. I think I would prefer to replace the original, but don't know if this would be "going backward." The bike currently has a power fall-off at 3500RPM, then picks back up at 5000ish. Do any of you think the constant flow of the electric pump could be at fault?
I doubt it. The mechanical fuel pump (which is driven by a the right cam shaft) also provides a constant fuel flow. If the electric pump was not able to keep up with the demands, you would not have it pick back up again. Also, is this just idling in neutral? It actually takes very little fuel to spin the engine up with no load. Where you find a lack in fuel delivery normally is at high speeds, when aerodynamic drag is at its highest, and fuel demand is also at its highest. People will normally say something like "I can't get the bike to go faster than xx mph" - and the problem is normally a fuel restriction (i.e. dirty fuel filter) or failing fuel pump.
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DocDan
Posts: 14
Joined: Fri Nov 13, 2015 10:46 am
Location: St. Louis, MO
Motorcycle: 1982 GL1100

Re: Electric vs mechanical fuel pump

Post by DocDan »

Unfortunately, the loss of power occurs at both idle and while driving. Fortunately, if your patient, once it hits 5000RPM, it will easily get up to highway speeds, 75+.
"To diagnose, one must observe and reason."
-Galen The Healer c. 163 AD
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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Electric vs mechanical fuel pump

Post by RBGERSON »

Well..if the electric pump doesn't have a auto-shutoff if the bike goes down I'd either replace the it with an OEM pump or install a shut-off..New pumps are still available from Honda $90 with shipping or so and used ones on eBay..and they can be rebuilt but it's not a simple process, how to's on the NGW site. I have some working used pumps $55 with shipping in the USA.

PM me if you are interested in a used one.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB
f1xrupr
Posts: 450
Joined: Mon Jan 13, 2014 6:13 am
Location: Triplet Va
Motorcycle: 1980 gl 1100 Std. Vetter

Re: Electric vs mechanical fuel pump

Post by f1xrupr »

I'm running an e-pump on my 1100-was on it when I got it-works great. I installed a safety shut-off (oil pressure switch). As mentioned, would be bad in a accident without one.
My exercise bike is a goldwing.
KLRRich
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Joined: Fri May 17, 2019 12:30 pm
Location: La Crescenta, CA. USA
Motorcycle: 1982 GL1000

Re: Electric vs mechanical fuel pump

Post by KLRRich »

Hi, So I just bought an 82 goldwing. The camshaft tip that powers the mechanical fuel pump is busted. I got a new mechanical pump but it's useless. I'd like to shift to an electric pump. Any thoughts on which one will work the best for this model? Thanks.


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