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Car Forum / MINI / December 2003right-hand fuel tank
Can you fit a right-hand fuel tank to a MPI mini? What type of filler caps should you use vented or non-vented? Same on each? How/ where do you plumb it in? Rgds, P. > Can you fit a right-hand fuel tank to a MPI mini? Probably... More accurately, yes, I'm sure it can be done, but the plumbing may be complicated. > What type of filler caps should you use vented or non-vented? Same on each? An MPI Mini almost certainly has a sealed cap and a vapor recovery system, so you'd need to use a sealed cap on the extra tank. > How/ where do you plumb it in? If the MPI Mini is anything like other injected cars, it will have a fuel pump inside the tank. There should be a high pressure delivery line to the engine bay, a return line to the tank, and a vapor line from high up in the tank for vapor recovery. Does anyone have a manual for an MPI with details of the standard plumbing? Assuming the Mini MPI system is conventional, as above, the simplest way is probably to connect the right hand tank outlet direct to the left hand tank so that it drains into the left tank. * You cannot connect it direct to the fuel line to the engine like you would with a carby car because that line is after the fuel line. The fuel pump would simply transfer all the fuel from the left tank to the right tank, which would overflow, and nothing would reach the motor. * You probably cannot connect it direct to the fuel return line, because the slight back pressure of the swirl pot inside the left tank will cause the right tank to overflow. If you can get a non return valve to fit into the line from the right hand tank, you could connect it to the return line. Otherwise, you'll probably have to add a new inlet near the bototm of the left tank and connect the right tank outlet to it. You also need to connect the right tank to the vapor recovery system. A t-piece in the vapor recovery line at the top of the left tank, with a similar connection to the top of the right tank would be fine. If you attempt to fudge it by putting a vented cap on the right tank, you WILL get problems with the vapor recovery system sucking fuel from the right tank into the left and overflowing into the vapor recovery system. > > Can you fit a right-hand fuel tank to a MPI mini? > [quoted text clipped - 45 lines] > the right tank into the left and overflowing into the vapor recovery > system. ................ Hi All, I am thinking of doing this type of mod to my mini,,,, so couldn't it just be a case of fitting a balance pipe connecting both tanks at the lowest point, with a vent pipe connecting both tanks at the highest point, creating a slave tank effect, this would not interrupt the master tank or the pressure pump or the return fuel line, Fitzy > > > Can you fit a right-hand fuel tank to a MPI mini? > > [quoted text clipped - 47 lines] > > system. > ................ > I am thinking of doing this type of mod to my mini,,,, so couldn't it just be > a case of fitting a balance pipe connecting both tanks at the lowest point, with > a vent pipe connecting both tanks at the highest point, creating a slave tank > effect, this would not interrupt the master tank or the pressure pump or the > return fuel line, Typical. I spend half an hour writing a long dissertation on how to do it, and someone comes along and manages to say the same thing in 5 lines. 8-) Yeah, a balance line at the top to keep the levels the same and a connection btween the tops to let the vapor recovery system clear them both... What does the Wood & picket kit consist of, anyone know? http://www.woodandpickett.com/menu_templates/list_menu.cfm?menu_temp=general .cfm&dep_id=13&prod_a.s=1&a.s_id=126&catalogue=mini&dep_no=13&CFID=2110126&C FTOKEN=58106583 The injection kit is cheaper than the carb kit. So must contain less?? Presumably it does not need soldering/welding. Rgds, D > > > > Can you fit a right-hand fuel tank to a MPI mini? > > > [quoted text clipped - 63 lines] > connection btween the tops to let the vapor recovery system clear them > both... Sorry about that Graham, I just couldn't get my head around all the connections you quite rightly suggested And as I have been contemplating this for a while, I was convinced just the top & bottom pipes would do the job, I am in the process of converting a L/H tank, and inserting the necessary pipe connections, 13mm lower balance pipe and a 5mm vacuum top pipe,This would allow me to fill up from one tank, I'm Thinking that the 13mm lower pipe should incorporate an adjustable restrictor, to reduce the rapid movement of fuel from one tank to the other when cornering , by adjustable I mean a type of in line shut-off valve you can buy from a plumbers merchant, when open it's about 10mm inside diameter, but with the valve closed I would drill a 3-5mm hole through the valve gate, I hope I have explained this idea correctly, What do you think, Graham does anyone have any other ideas Sorry for the long post Guys Fitzy > > > > Can you fit a right-hand fuel tank to a MPI mini? > > > [quoted text clipped - 63 lines] > connection btween the tops to let the vapor recovery system clear them > both... > > Typical. I spend half an hour writing a long dissertation on how to do > > it, and someone comes along and manages to say the same thing in 5 > > lines. > > 8-) > Sorry about that Graham, > I just couldn't get my head around all the connections you quite rightly > suggested > And as I have been contemplating this for a while, I was convinced > just the top & bottom pipes would do the job, Yep. Thats pretty much what I said in 50 lines. > I am in the process of converting a L/H tank, and inserting the necessary > pipe connections, 13mm lower balance pipe and a 5mm vacuum top pipe,This > would allow me to fill up from one tank, I doubt 13mm (1/2") will be big enough to balance fast enough to fill from one tank only, though it will certainly be quicker to level off than standard twin tanks with a 1/4" line, which can take about 10 minutes from memory. > I'm Thinking that the 13mm lower pipe should incorporate an adjustable > restrictor, to reduce the rapid movement of fuel [quoted text clipped - 4 lines] > correctly, > What do you think, Graham If you live somewhere where LPG conversions are available, you can buy an electronic solenoid operated petrol valve (called a lockoff), though of course it will only be for 5/15" fuel line. Apart from sloshing on corners, which isn't likely to be a problem, you may also experience problems when parking on uneven ground with one side lower than the other. The higher tank drains out the lower tanks filler neck... This alone is probably a good reason to put a valve in the lower crossover line. > > > Typical. I spend half an hour writing a long dissertation on how to do > > > it, and someone comes along and manages to say the same thing in 5 [quoted text clipped - 36 lines] > neck... This alone is probably a good reason to put a valve in the lower > crossover line. .................................... Fitzy wrote,,,,,,, A Lock off valve,,, now why didn't I think of that, a feed from the ignition to open the valve when running and Shut-off when parked,,,,,,,, Thanks Graham, Fitzy |
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