FUEL SYSTEM - 3A-790-826148R2 MARCH 1997
Testing
Installclear fuelhose(s) between fuelpump and car-
buretor(s). Run engine, and inspect hose(s) for air
bubbles. If air bubbles are found, see “Air Bubbles in
Fuel Line” . If air bubbles are NOT found, see “Lack
of Fuel Pump Pressure”.
PROBLEM: AIR BUBBLES IN FUEL LINE
Possible Cause Corrective Action
Low fuel in tank. Fill tank.
Loose fuel line connec-
tion.
Inspect and tighten con-
nections.
Fuel pump fitting loose. Tighten fitting.
A hole or cut in fuel line. Inspect condition of fuel
lines and replace any
found bad.
Fuel pump anchor
screws loose.
Inspect and tighten all
screws.
Fuelpumpgasketsworn
out.
Rebuild fuel pump.
PROBLEM: LACK OF FUEL PUMP PRESSURE
Possible Cause Corrective Action
Anti-siphon valve. Refer to “Checking for
Restricted Fuel Flow
Caused by Anti-siphon
Valves” preceding.
Air in fuel line. “Air Bubbles in Fuel
Line,” preceding.
Dirty or clogged fuel fil-
ter.
Clean or replace filter.
Dirty or clogged fuel
pickup in fuel tank.
Clean or replace pickup.
Worn out fuel pump dia-
phragm.
Rebuild pump.
Defective check valves
in fuel pump.
Rebuild pump.
Broken check valve re-
tainer.
Rebuild pump.
Pulse hole plugged. Remove pump and
clean out hole.
Hole in pulse hose. Replace pulse hose.
Loose pulse hose. Tighten connection.
Boostdiaphragmgasket
distorted or out of place.
Check seal between
mating surfaces where
“rib”dividespulsecham-
ber. Gasket must align
with rib. Align or replace
gasket as necessary.
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