cecil_t
XS400 Member
My '80 XS400 has a vacuum operated petcock. It was leaking, and I ordered a rebuild kit, and it was still leaking. After finding a detailed thread here on this forum I re-rebuilt it and now the vacuum operation seems to be working OK. I have a manual on/off valve installed in the fuel line under the petcock just in case.
However, I have no reserve. The "on" position on the petcock will drain the tank completely. I thought there was possibly an internal leak in the petcock that was leaking from PRI or RES to the On position but since everything else seems to be working I don't think that theory is holding water anymore. I have a scope I put into the fuel tank and I see a small oval shaped tower sticking up a few inches from the petcock, where I assume both pickups are inside (is that a screen filter?).
So my question is this - what could be wrong?
However, I have no reserve. The "on" position on the petcock will drain the tank completely. I thought there was possibly an internal leak in the petcock that was leaking from PRI or RES to the On position but since everything else seems to be working I don't think that theory is holding water anymore. I have a scope I put into the fuel tank and I see a small oval shaped tower sticking up a few inches from the petcock, where I assume both pickups are inside (is that a screen filter?).
So my question is this - what could be wrong?