Because my coach is a vapor lock queen, after making all the modifications recommended by various experts which didn't solve the problem, I finally
installed in-tank fuel pumps about 5 years ago. They did solve the problem.
On my way to the GMC 49er Rally in Colfax, I suddenly lost power on a narrow, highly traveled road and wasn't able to figure out the problem until I
had the coach on the side of the road with trucks and other vehicles whizzing by. I soon figured out what was wrong before I got run over and
switched to the spare tank pump and continued on my way. Normally I would have switched over while the coach was moving and solved the problem. I
did that but no quick response. The problem is that I have now installed a Fitech Fuel Command center which was completely drained and takes some
time to fill and get back into action.
Anyway, once back home, I pulled up the carpets and removed and replaced the pump and decided to cut it open to see what was wrong. The pump contains
a small electric motor driving a turbine pump. What had happened is that one of the brushes got stuck in its passageway and lost contact with the
armature. No evidence of any contamination and lots of brush left, so it's a mystery to me. The tank was almost full, so the pump had plenty of fuel
to cool it.
I also discovered those pumps are power hungry! I measured 3.4 Amps when running and pumping. That's 40 watts!
--
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
installed in-tank fuel pumps about 5 years ago. They did solve the problem.
On my way to the GMC 49er Rally in Colfax, I suddenly lost power on a narrow, highly traveled road and wasn't able to figure out the problem until I
had the coach on the side of the road with trucks and other vehicles whizzing by. I soon figured out what was wrong before I got run over and
switched to the spare tank pump and continued on my way. Normally I would have switched over while the coach was moving and solved the problem. I
did that but no quick response. The problem is that I have now installed a Fitech Fuel Command center which was completely drained and takes some
time to fill and get back into action.
Anyway, once back home, I pulled up the carpets and removed and replaced the pump and decided to cut it open to see what was wrong. The pump contains
a small electric motor driving a turbine pump. What had happened is that one of the brushes got stuck in its passageway and lost contact with the
armature. No evidence of any contamination and lots of brush left, so it's a mystery to me. The tank was almost full, so the pump had plenty of fuel
to cool it.
I also discovered those pumps are power hungry! I measured 3.4 Amps when running and pumping. That's 40 watts!
--
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
