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I just pulled one at random to show the general shape and size. I wasn't reading the specs.The oem unit you show is not the same as is on my Jackal tank. Mine looks more like this one, except it uses that pipe coupler to connect directly to the fuel tank -- no flange. I don't have it handy to look at. My point being that there is at least one other type out there.http://www.ebay.com/itm/00-Moto-Guzzi-LeMans-Sport-V11-FUEL-PRESS-RETURN-RELIEF-VALVE-/130931711182?pt=Motorcycles_Parts_Accessories&hash=item1e7c235cce&vxp=mtrYep, you are absolutely right. I didn't look past the 1998 EV years. Apparently the change occurred in 1999.If this variant had a coupler it would be a good match for mine. It might be the same as the one above without the flange. With the proper coupler, this one is a bolt-on conversion of an early tonti tank to efi service.This looks like the one used on early HD F. I systemshttp://www.ebay.com/itm/2002-Moto-Guzzi-California-EV-1100-S332-fuel-pressure-regulator-assembly-/350916145772?pt=Motorcycles_Parts_Accessories&hash=item51b43b726c&vxp=mtr
My 1998 EV left me stranded at the Arkansas rally last month. FPR developed a leak in the diaphragm, with fuel leaking on the engine. Not good.A little research revealed that all F.I. California and Quota models used the same regulators from 1993 to about 2003 when in-tank fuel pumps were used. Should be plenty of new ones to be had. Noooooo. And reasonably priced. Nooooo. Found one at about $180 + shipping - if in stock. A little more research revealed that the MG/Weber regulator was set to deliver fuel to the injectors at 2.5 bars, the fuel pump at 3.0 bars and up to the regulator. Above 5 bars, a check valve opened up in the fuel tank/pump recirculation connection.In short, I found a regulator used in auto applications, for all purposes, identical to the Weber specs--- 2.5 bars, hose nipples are the same sizes with tank return. Mounting will be different but zip ties will do the trick. I had planned to replace all fuel lines so location won't be a problem.I'll report back later after installation but it'll be awhile. The Quota runs just fine for now. PR-159 on right.BTW, the regulator part # PR-159 made/marketed by several manufacturers. About $50+/-.