Fuel tank and pump, advice needed.

26-01-2011, 08:28 PM

Quote:

Originally Posted by Dukedesmo

I have an early (steel) injection tank for my carby monster. The pump and filter clip inside (as on the SS) and I plan to use the injection pump by fitting a loop with a 'T' to the carbs but no pressure regulator. That way there won't be any real pressure and the excess fuel will simply recycle to the tank and not (I hope) swamp the carbs.

If it causes a problem, I'll get a carby SS pump but I'm confident it'll be OK.

that's exactly how the carby SS seems to work

Dukedesmo · 26-01-2011, 08:29 PM

Quote:

Originally Posted by Scotty

that's exactly how the carby SS seems to work

Maybe the pump's the same?, it looks the same right down to the 'teabag' filter...

utopia · 27-01-2011, 12:06 AM

Wow, thanks.
Thats a top-hole, numero uno, first class response....
......and exactly what I hoped I'd hear.

I hadn't really thought the pressure thing through very much, cos I also thought it would be possible to swap to a carby-type pump from the SS. Your system sounds like it should deliver the goods though. The only thing I can think might happen would be that the pump would constantly run too fast due to having no pressure to work against, and overheat. But the carby pumps do look the same, don't they ?

Do you know exactly what year your tank was made ? ....The tanks I've seen have the date stamped on the rear hinge bracket, or maybe there's a sticker, or part number on it...?
Also, is it possible to see the pump clips through the filler hole.
....I've been searching ebay, but identification is sometimes difficult.

The reason I've ended up wanting to get rid of the external vacuum pump is partly for the sake of tidiness (both practical and aesthetic), but it came about after I bought some carbon airscoops. I'd got them for a mixture of reasons...part pure aesthetic, part to try to keep the rain off the electrics around there, and part because of a possible improvement to rear cylinder cooling. BUT when I look down the right hand scoop there's a thing like a can of tuna right in the firing line. Since I'm looking for a spare tank anyway, ........

Thanks for the parts catalogue link. I think the info I need may come in around 2001, and/or it may be slightly earlier,....I haven't checked yet.

Incidentally, I was still thinking of using the vacuum fuel tap thats fitted to my model.

Thanks again.
Its my round.

Dukedesmo · 27-01-2011, 09:53 AM

My tank was from a 2000 M900ie 'Metallic', here are some pics;

Underside;

Pump clip as seen through filler hole:

Pump, sender & filter;

AFAIK these tanks were made in 2000/2001 for M900ie and are easily spotted by the fact that they are metal, have the large filler cap hole (to get your hands in for servicing) and 4 fuel line connections underneath (flow, return, breather & overflow).

As for the pump overheating, I doubt it as they run constantly anyway using the fuel to cool/lubricate it, and with no pressure build-up I would think it should be less stressed.

Of course the fuel will be swirling around the tank, which it wouldn't with the vacuum pump but I can't see what problem that would cause other than noise - and I seriously doubt I'll be able to hear it when the engine's running.

Other than lack of pressure regulator this is exactly how my 916 works and I've never had any problems with the fuel system on that in 13yrs.

Using a fuel tap isn't a good idea because if it's closed and the pump is pumping that will damage something and with a pumped system when the pump isn't running the fuel won't come out anyway as the outlet from pump and filter sits high in the tank, so you don't need a shut-off valve for when the engine's not running - I'll probably fit some in-line push fit connectors to the fuel lines, the kind that seal when released to make tank removal easier for maintenance/tinkering though.

utopia · 28-01-2011, 01:21 AM

My cup runneth over with helpful info.
Thanks again.

I'm having a slow ponder about the pump issue.
Also the tap issue.

....to be continued.

27-01-2011, 09:53 AM	#4
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,844	My tank was from a 2000 M900ie 'Metallic', here are some pics; Underside; Pump clip as seen through filler hole: Pump, sender & filter; AFAIK these tanks were made in 2000/2001 for M900ie and are easily spotted by the fact that they are metal, have the large filler cap hole (to get your hands in for servicing) and 4 fuel line connections underneath (flow, return, breather & overflow). As for the pump overheating, I doubt it as they run constantly anyway using the fuel to cool/lubricate it, and with no pressure build-up I would think it should be less stressed. Of course the fuel will be swirling around the tank, which it wouldn't with the vacuum pump but I can't see what problem that would cause other than noise - and I seriously doubt I'll be able to hear it when the engine's running. Other than lack of pressure regulator this is exactly how my 916 works and I've never had any problems with the fuel system on that in 13yrs. Using a fuel tap isn't a good idea because if it's closed and the pump is pumping that will damage something and with a pumped system when the pump isn't running the fuel won't come out anyway as the outlet from pump and filter sits high in the tank, so you don't need a shut-off valve for when the engine's not running - I'll probably fit some in-line push fit connectors to the fuel lines, the kind that seal when released to make tank removal easier for maintenance/tinkering though. __________________ M900, 916, LeMans II.

27-01-2011, 12:06 AM	#3
utopia No turn left unstoned Join Date: Jun 2010 Location: leicester Bike: M750 Posts: 4,545	Wow, thanks. Thats a top-hole, numero uno, first class response.... ......and exactly what I hoped I'd hear. I hadn't really thought the pressure thing through very much, cos I also thought it would be possible to swap to a carby-type pump from the SS. Your system sounds like it should deliver the goods though. The only thing I can think might happen would be that the pump would constantly run too fast due to having no pressure to work against, and overheat. But the carby pumps do look the same, don't they ? Do you know exactly what year your tank was made ? ....The tanks I've seen have the date stamped on the rear hinge bracket, or maybe there's a sticker, or part number on it...? Also, is it possible to see the pump clips through the filler hole. ....I've been searching ebay, but identification is sometimes difficult. The reason I've ended up wanting to get rid of the external vacuum pump is partly for the sake of tidiness (both practical and aesthetic), but it came about after I bought some carbon airscoops. I'd got them for a mixture of reasons...part pure aesthetic, part to try to keep the rain off the electrics around there, and part because of a possible improvement to rear cylinder cooling. BUT when I look down the right hand scoop there's a thing like a can of tuna right in the firing line. Since I'm looking for a spare tank anyway, ........ Thanks for the parts catalogue link. I think the info I need may come in around 2001, and/or it may be slightly earlier,....I haven't checked yet. Incidentally, I was still thinking of using the vacuum fuel tap thats fitted to my model. Thanks again. Its my round.

28-01-2011, 01:21 AM	#5
utopia No turn left unstoned Join Date: Jun 2010 Location: leicester Bike: M750 Posts: 4,545	My cup runneth over with helpful info. Thanks again. I'm having a slow ponder about the pump issue. Also the tap issue. ....to be continued.