Fuel tank and pump, advice needed.

umm, also from memory the carb tank and the IE tank are ever so slightly different shapes so that the cut out where the seat joins 'isn't quite right' you might also want to look for a matching seat unit to go with the tank

also looking at my S4 tank (that's injection) the fuel pump clip is in the middle of the tank and the tea bag filter has the nozzle in the middle

[utopia]

Yes, I was aware that there might be an issue with the fit of tank to seat, but I'm not too sure how many variants there are, or which bits go with which.
I've looked at a tank from a slightly older carby monster ('98) and the tank/seat recess was a slightly different shape to my original parts......the front, pointy bit of the seat has a larger radius (about like a £2 coin) on my original, Y2K parts, whereas the earlier parts had a much smaller radius (more like a 1/2p coin).
From what I've seen so far, I think the injection tanks also had the larger radius, so I'm hoping that my seat is the same, but I have yet to confirm that.

ps....just looked again at Capo's recent 'fuel system tech' post and, lo and behold, there is a picture of the pump and tank internals in question.
Also, from the same post, the pump in the injection system delivers fuel to a pressurised chamber (in this case the fuel delivery line) at 3bar, from which excess fuel is discharged back to tank via a pressure control valve. Hence the injection pump operates against a pressure of 3bar the whole time, as opposed to the carby system which presumeably has no control valve and operates at 1bar, ie atmospheric pressure.
This was the reason I was wondering if the injection type pump would run too fast and overheat, though I guess the system should still work unless or until the pump burns out.
I dunno whether this would be the case or not, but either way the pump from a carby system should avoid the problem, I would expect.

I'm still pondering.

Originally Posted by Scotty

umm, also from memory the carb tank and the IE tank are ever so slightly different shapes so that the cut out where the seat joins 'isn't quite right' you might also want to look for a matching seat unit to go with the tank

Don't I know it!! It isn't just different between carb and IE tanks but not all carb tanks are the same.........

I'm living with "seat mismatch" issue as it's preferable to the "leak enough petrol to BBQ you" issue..........

It's usually only picked up by the anoraks / trainspotters amongst us though...........

[gary tompkins]

Originally Posted by Gordon H

Don't I know it!! It isn't just different between carb and IE tanks but not all carb tanks are the same.........

I'm living with "seat mismatch" issue as it's preferable to the "leak enough petrol to BBQ you" issue..........

It's usually only picked up by the anoraks / trainspotters amongst us though...........

Oh I don't know Gordon - even a blind man in a sack would be able to spot that

Maybe you should stick a couple of these on the tank? Could avoid loosing any small children or pet dogs in there.

http://www.zazzle.co.uk/mind_the_gap...95099998901813

[engage anorak mode]

The seat and tank shape changed around year 2000, and effected any carbed or EFI monsters made after that date. Only easy way to avoid gap problems is to fit matched tank/seat combinations, however installing late seats to early frames isn't as straight forward as swapping tanks. The rear frame section and seat latching arrangement changed as well, so it'll need a fair bit of fettling to sort out. Later tanks are easily identified by the shape and size of the knee cut-outs. These are much more rounded on the post Y2K design, where as early monsters have a sharper straight edge at the top. Seat cut-out indent is the less obvious change between the two.

[anorak mode off]

Originally Posted by gary tompkins

Oh I don't know Gordon - even a blind man in a sack would be able to spot that


The seat and tank shape changed around year 2000, and effected any carbed or EFI monsters made after that date. Only easy way to avoid miss-match is to fit matched tank/seat combinations, however installing late seats to early frames isn't as straight forward as swapping tanks. The rear frame section and seat latching arrangement changed as well, so it'll need a fair bit of fettling to sort out.

Jeeeez, everyones a critic!!!!! Yep already looked into changing the seat over but in the great scheme of things and working on the basis that not everyone has such a keen eye for detail as the Hants / Wilts lot...... I'll live with the gap (well, till I get round to sorting out the original tank anyways)

Now, I wonder if the cans off a 750ss can be fitted to the 900..........

[gary tompkins]

Originally Posted by Gordon H

Jeeeez, everyones a critic!!!!! Yep already looked into changing the seat over but in the great scheme of things and working on the basis that not everyone has such a keen eye for detail as the Hants / Wilts lot...... I'll live with the gap (well, till I get round to sorting out the original tank anyways)

Now, I wonder if the cans off a 750ss can be fitted to the 900..........

Sorry Gordon - did I touch a nerve?

I'm sure it hardly shows from a distance.. such as earths geostationary orbit for example

Originally Posted by gary tompkins

Sorry Gordon - did I touch a nerve?

I'm sure it hardly shows from a distance.. such as earths geostationary orbit for example

Nope, fine here!!

[gary tompkins]

Good.. see quick edit on post #19

[utopia]

Originally Posted by Gordon H

.....It's usually only picked up by the anoraks / trainspotters amongst us though...........

er.....guilty, as charged, then.........