Fuel Pump Output


Information and questions on GL1200 Goldwings (1984-1987)
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filupsd
Posts: 84
Joined: Fri Sep 07, 2012 1:07 pm
Location: Rolla, Missouri
Motorcycle: 1984 GL 1200 Standard

Fuel Pump Output

Post by filupsd » Thu Aug 02, 2018 7:49 pm



I know this is part of a larger topic and I have read through several of the threads on Prelude fuel pumps. I replaced my fuel pump a couple of years ago with one from a 1985 prelude. Since then my mileage plummeted to 25MPG. I started checking specs for the OEM Goldwing pump vs the Prelude pump. According to the service manual, the OEM pumps about 16.9 oz per minute or 7.9 gal./hour. The prelude specs are 25gal/hour so I'm pushing too much fuel Right?

How do I regulate the fuel from this pump?



Shadowjack
Posts: 37
Joined: Wed Aug 17, 2011 5:22 pm
Location: Bellevue, NE
Motorcycle: 1977 GL1000
1975 CB750
2011 NT700VA

Re: Fuel Pump Output

Post by Shadowjack » Sun Aug 05, 2018 8:30 am

It's not the flow, it's the pressure. As long as the replacement pump doesn't put out more pressure than the original, it will be fine. If there's more, the pressure will lift the float needle off the seat and flood out. I don't recall the specs, but the Prelude pump is supposed to be comparable to the GW pump--about 3 or 3.5 lbs. You could measure it, if you could find a low enough pressure gauge.

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