Fitted a low pressure facit fuel pump used to get 180 miles to the tank now getting 100 miles time to look for a replacement vacuum one
Is Electric Fuel Pump Causing Problems
Started by
madmopedracer
, Aug 17 2018 09:53 pm
15 replies to this topic
#2
wicklamulla
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Posted 17 August 2018 - 10:47 pm
Fitted a low pressure facit fuel pump used to get 180 miles to the tank now getting 100 miles time to look for a replacement vacuum one
did you notice the increase in fuel consumption immediately after fitting the electric pump ?
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#3
madmopedracer
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Posted 18 August 2018 - 08:11 am
Thought it was another problem missfire and cutting out on one cylinder fixed that needed new RR I don't notice fuel consumption on short journeys this is the first long run in a while
#4
TKH
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Posted 18 August 2018 - 03:48 pm
Fuel leak anywhere? That's and awful lot of disappearing fuel.
#5
madmopedracer
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Posted 18 August 2018 - 03:53 pm
just back from the lakes weekend aborted as someone took my mate out on his 900 om motorway nr oxford
just bruised ribs think the bike is not too bad could have been worse
weather was awful if i get time tomorrow a good clean and ill start investigation as electricity leak is sorted
so one thing ruled out
#6
TKH
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Posted 18 August 2018 - 07:21 pm
All the best to your mate and I hope he's well soon.
#7
Sidarta
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just half a litre to go
- Location:Brasil - MG -
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Posted 18 August 2018 - 09:53 pm
Hi madmopedracer!
Due to the translation, I did not quite understand the relation: how many miles x how many liters. 
Did you check the oil level? Depending on the pump (pressure ??), height of the buoys and condition of the sealing of the needles of the buoys, the excess may have gone into the engine oil. I find it difficult, because you talk about long journey, therefore greater engine rotation.
However it is worth checking, by removing the top cover of the oil compartment and sniffing.
If smell gasoline; Bingo.
But, no smell of gas .... 
Cheers!
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Sidarta
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#8
Bjørge
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Posted 19 August 2018 - 06:46 am
You could check out the emulsion tubes for wear, poor mileage is a well known side effect of worn ones....
Bjørge
#9
madmopedracer
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Posted 19 August 2018 - 11:53 am
i have some time off work at the end of the month so will have time to check it out.
this has been a sudden change in fuel consumption not a gradual decrease
usually i get about 55mpg now around 35 to 40 mpg
#10
dablik
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Posted 19 August 2018 - 12:08 pm
Apart from a leak dont know what else except emulsion tubes could cause it, doubt the pump is at fault though, should either work or not !!
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#11
Apache
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Posted 19 August 2018 - 01:38 pm
100 miles a tank or to reserve tap switchover ? Tap or tap filter blockage causing switchover too early ? Just a thought....
#12
Studley Ramrod
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Posted 19 August 2018 - 03:42 pm
Is it possible you got yer calcs wrong ? Maybe thought you'd filled it but hadn't, or summat similar.
I know a faulty coil can increase consumption, as can a damp HT lead.
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#13
madmopedracer
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Posted 19 August 2018 - 03:46 pm
to reserve
it may be coincidence that it has only come to notice since changing the pump
#14
Bjørge
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Posted 19 August 2018 - 09:34 pm
The other possibility may be stuck choke plungers - if so, they would show symptoms of fat mixture: a) Easy cold start with no choke and b) poor running when hot / black deposits in exhaust outlet tube / maybe some black smoke
Bjørge
#15
TKH
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Posted 20 August 2018 - 11:04 am
Choke sticking or the bike overfueling can often be picked up with someone following behind, as well as black deposits on spark plugs, etc.
#16
madmopedracer
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Posted 20 August 2018 - 03:41 pm
100 miles before going to reserve had to top it up 4 times on trip to penrith and back
will look at all the suggestions when I next get a chance to look at it
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