Piper Dakota - Inspection and Tightening of Fuel Line Union Fittings; Installation of Electric Fuel Pump; Lines and Fittings

INSTALLATION OF ELECTRIC FUEL PUMP
1. Position fuel pump to firewall and secure with bolts, washers, and nuts.
2. Connect fuel lines to pump.
3. Connect electrical leads to pump.
4. Turn fuel shutoff ON and operate fuel pump. Check all fuel line fittings for leakage.
5. Install cowling.
LINES AND FITTINGS
INSPECTION AND TIGHTENING OF FUEL LINE UNION FITTINGS
1. Remove aft inboard inspection panel from lower surface of right and left wing.
2. Remove pilot’s seat and left cabin side panel. Fold back carpeting that covers forward side of spar box
and remove cover from fuel lines.
3. Inspect all union fittings use in fuel system for signs of leakage. Note any leaking fittings for later re-
check.
4. Using a torque wrench and a tubing crow’s foot and carefully tighten each union fitting to values listed
below:
Tube Size Applied Torque
1/4 in. OD 75-95 inch-pounds Using a Tubing
3/ 8 in. OD 175-195 inch-pounds Crow’s Foot
—CAUTION—
Using a crow’s foot adapter other than a tubing type will result in
deformation or severe damage to the union nut and will probably
cause a leak which will require replacement of the union and
tubing.
—CAUTION—
If during the torque check a galled nut and union are suspected,
back off the nut and inspect the threads. If the union is
serviceable, apply a thread lube such as Slip Spray Lubricant
(Dupont) or Ferrulube (Parker-Hannifin), and torque the nut to
the proper values as listed in step 4. If the union is unserviceable,
it must be replaced per instructions given in paragraph titled
Replacement of Fittings.
—CAUTION—
Apply thread lubricant to male connector threads only. Be careful
that no lubricant enters throat of connector seat or contacts
ferrule seat face.
5. After tightening each fitting, measure distance between face of union nut and face of tubing nut. Refer
to figure 28-5 for tolerance.
6. Any fitting found out of tolerance must be replaced in accordance with instructions in Replacement of
Fittings.
28 - 24 - 00
Page - 28-11
Reissued: August 1, 1986
2B5
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL