(PICTURES ON THE WEB PAGE)
DIGI-PANEL FUEL PRESSURE GAUGE
During the testing of the Howell TBI , it became clear that we would like
to measure the fuel pressure
that is applied to the Injectors. Measuring this pressure is also very
helpful to determine if there are bad
fuel pumps, plugged filters or gas tanks. Mr.C had a great idea to make
use of the Digi-Panel to
measure this parameter.
This is Mr.C under the coach installing the pressure sender. We
elected to put the Pressure
sender at the fuel pumps which are located just after the tank selector
valve. The sender is the same one
(part number shown above) used for the Oil pressure on the GMC coach and
was purchased from
Digi-Panel for $13.00 .
The Sender supplies a variable resistance of about one ohm per
pound. The Howell system
operates at a fuel pressure between 16 and 24 pounds. This will give
about a one half scale reading on
the Digi-Panel. This measurement does not require extreme accuracy since
the application is show if
there is a problem from the normal operating conditions. It is possible to
read the resistance of the
sender with a digital meter using the one ohm per pound calibration.
The Digi-Panel has a hole already punched in the front panel that
can be used to insert a
switch. This switch is wired to select the alternate senders for the
Oil/Gas Pressure, and the In/Out
transmission oil temperatures. I will supply a wiring diagram soon.
The new switch is added to the right of the Alarm switch on the
Digi-Panel . I have labeled
the switch as "OIL" in the up position. When the switch is in the down
position, the Fuel Pressure is
measured. My Howell TBI is currently running at 20 ohms and 20 pounds on
the Digi-Panel.
gene
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
DIGI-PANEL FUEL PRESSURE GAUGE
During the testing of the Howell TBI , it became clear that we would like
to measure the fuel pressure
that is applied to the Injectors. Measuring this pressure is also very
helpful to determine if there are bad
fuel pumps, plugged filters or gas tanks. Mr.C had a great idea to make
use of the Digi-Panel to
measure this parameter.
This is Mr.C under the coach installing the pressure sender. We
elected to put the Pressure
sender at the fuel pumps which are located just after the tank selector
valve. The sender is the same one
(part number shown above) used for the Oil pressure on the GMC coach and
was purchased from
Digi-Panel for $13.00 .
The Sender supplies a variable resistance of about one ohm per
pound. The Howell system
operates at a fuel pressure between 16 and 24 pounds. This will give
about a one half scale reading on
the Digi-Panel. This measurement does not require extreme accuracy since
the application is show if
there is a problem from the normal operating conditions. It is possible to
read the resistance of the
sender with a digital meter using the one ohm per pound calibration.
The Digi-Panel has a hole already punched in the front panel that
can be used to insert a
switch. This switch is wired to select the alternate senders for the
Oil/Gas Pressure, and the In/Out
transmission oil temperatures. I will supply a wiring diagram soon.
The new switch is added to the right of the Alarm switch on the
Digi-Panel . I have labeled
the switch as "OIL" in the up position. When the switch is in the down
position, the Fuel Pressure is
measured. My Howell TBI is currently running at 20 ohms and 20 pounds on
the Digi-Panel.
gene
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
