We at Moto International have had our share of complaints of cold starts, stalls, and hesitant throttle response on Moto Guzzi Stelvio NTX models. Upon further investigation we discovered some production inconsistencies in fuel pump assemblies. The weak links are plastic-to-plastic connection between fuel pump and filter as well as fairly poor single o-ring seal between original plastic fuel filter and plastic fuel pump housing.
These sealing inconsistencies can result in low fuel pressure readings and therefore poor throttle response, as well as poor idle or cold starts. To remedy, we prepared a simple kit with instructions to follow. Kit consists of an all metal fuel filter, two fuel clamps, special metric submersible fuel line and one additional o-ring to be used.
So whether you are trying to ensure proper fuel pressure, or you are simply replacing your fuel filter routinely, this is how we do it. If you plan an ECU reflash or Power Commander dyno run definately do this before hand.
There should be no more than a gallon or so of fuel in tank when attempting to do this.
Start by removing the seat and rear fuel tank cover, thereby exposing the fuel pump cap.
To remove the cap I tap the veins lightly with a screwdriver and soft mallet.
To remove the fuel line, push in the black plastic insert at the end of the line and, while holding, push and hold the gray collar towards the fuel tank. While holding the collar depressed, gently pull the plastic insert out. Residual fuel pressure will spray out if the bike was run recently - be prepared.
When removing the assembly from the tank be very careful not to damage the fuel level float arm or plastic track itself. Delicate setup.
To remove the filter and fuel line, start by removing two Phillips head screws and cutting the zip tie. The screws are going into a small metal plate that can fall out of its slot – don’t lose it.
Next, cut the fuel line clamp at the filter and remove the line. The spigot on the filter is plastic so pay attention not to break it.
Remove the o-ring and plastic adapter which we will be re-using on replacement metal filter.
Our kit on the left vs. original filter setup on the right.
Start assembly by stacking the plastic adapter and two o-rings as shown.
Lube the o-rings lightly and insert the filter into its respective housing. Next, lube both spigots and attach the hose and clamps all while being careful not to damage the fuel level sender.
Tighten clamps, Phillips screws and ensure proper wire routing on your re-finished assembly.
Assemble in reverse order. Cycle ignition on/off three times to prime the fuel pump before initial start up.
Big thanks to our customer Gordon Marx for allowing his bike parts to be photograph for this instruction.
If you have questions or comments in regards to this kit please contact us through email.
Credits: MM 2015