I am planning on an auxiliary gas tank on my r1100r rig. If I plumb into the return line of the tank will the fuel pump in the tank handle the gas from the auxiliary tank? Also do i need to have any kind of check valve in that line?Thanks for the great info on this site!
We have not done an R1100R this way. On some bikes we run the vent line from the main tank to the supply line on the aux tank. This must have a check valve in it. A good check valve that also gives you a back up plan is an electric non rotory fuel pump.
While we do make aux tanks most customer are opting for the Roto Pax fuel cansisters as a good low cost simple and reliable option. Just having a can allows you to use all of the fuel in your tank with out looking for a gas station as soon as the low fuel light comes on.
Jay G
DMC sidecars
www.dmcsiecars.com
jay@dmcsidecars.com
866-638-1793
I have installed a aux tank on my k100/EML. I spliced a hand valve and that forms a tee into the return line. A fuel pump from a Ford PU was put in line between the aux tank and the valve. With the hand valve closing the back flow to the injectors and open to the return line to the tank the pump is turned on to refill the gas tank. I used to do this on the fly until I realised that with the hand valve closed to back flow meant that the injector system was going full pump pressure with no fuel pressure regulation. I really didn't notice any change in performance but decided not to do it that way. My fuel light usually comes on at about 120 to 130 miles and I am ready for a rest stop any way. with the bike not running it takes less then 10 minutes to pump the fuel from the aux tank to the main tank. That is just a little longer then it takes me to pee. Harold in Kansas
Thanks for your responses. My current rig is basically a gravity feed teed into the line before the bikes fuel pump, but it is a carb bike. I like the idea of the rotopax for its simplicity. I have got some thinking to do.
I use a tourtank that is plumbed like your current one on your carbed bike - gravity fed. The tank is relatively inexpensive and they make them with multiple outlets/inlets so that you can pretty much plumb them anyway you like at that end and decide whether to use a vent line or plumb into the tank directly. I think check valves are always a good idea
Ok. "Always" is too strong. I can see a good loop system not necessarily needing it.
Is your bike FI or carb? I have a tour tank gravity fed on my other rig but it is a carb model. With the r1100 being FI I was not sure if it would work.
Mine is like your other one - carbed and gravity fed. Yes, you can utilize a pump in a number of ways to fee your 1100 tank and let the bike's fuel pump take over from there. I know some folks would rather just carry an extra tank that they can pour into the main tank at a stop. My own preference is to be able to do that on the fly. Different strokes for different folks. Hey, I voted for Romney, so I'm clearly not in the majority on everything. LOL
Romney was my choice too - guess its time to move to Colorado and smoke pot! Thanks for the info, like the idea of fueling on the fly also..
cool ideas, I have an 01 Sporty gravity/vacuum pump fuel system. I am planning to put a "hotdog" shaped 2.5 gallon air compressor tank converted to gas tank integrated into a home made back rest(vertical tank) and just gravity feed it into the fuel line with a shutoff valve under the main fuel tank.
Oh cool ideas include voting for Romney and moving to CO although the winters might night agree with us as well. I am from WV near DC
My KZ1000P-15 is gravity feed to carbs with a Pringle vacuum petcock. My plan is to use the 6 gallon poly fuel cell I got from my buddy's drag car mounted in back compartment of sidecar and plumb it with a hand switching valve. Going to lose the genius Pringle vacuum petcock and plumb in a normal manual petcock, then tee a manual switching valve between new petcock and carbs. Using an inexpensive Carter electric fuel pump at rear tank, with valve in one mode the open tank petcock and gravity feed fuels carbs. In the other switch valve mode close petcock so electric pump from auxiliary tank fuels carbs. Planning on a fuel pressure regulator inline to keep flow at 3 psi or so. The Carter pump has its own pressure sensor regulated at 5-7 psi.
If it was fuel injected with its own electric pump I'd do the same but include a switch for OEM electric FI pump on/off. This is commonly done on our FI diesels with remote tank & auxiliary pump and OEM electric lift pumps.
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