Isuzu N-Series. Service manual - part 526
6C-12 Fuel System
6
1.
Inspect the fuel system line connections
between the fuel tank and the fuel supply
pump for tightness and all fuel hoses for
cuts, cracks and for the use of proper
clamps.
2.
Draw fuel from the fuel tank at the fuel
line going to the fuel pickup tube to verify
a clean stream of fuel comes out (use the
hand-held vacuum pump 5-8840-0279-0
(J-23738-A) with a clear hose or
equivalent) This will ensure the fuel
pickup tube is not cracked drawing air
into the fuel line.
3.
Repair as necessary.
Did you find and correct the condition?
—
Go to Step 18
Go to Step 7
7
1.
Replace the fuel filter cartridge. Refer to
Fuel Filter Cartridge Replacement in this
section.
2.
Retest the fuel system vacuum test
described in Step 5.
Can a vacuum of at least the specified amount
be pulled on the fuel system?
8 inHg
Go to Step 18
Go to Step 17
8
1.
Unclamp or unplug the fuel line from Step
5 and reconnect the fuel line.
2.
Prime the priming pump until firmness is
felt.
3.
Crank over the engine for 5 seconds.
4.
Repeat steps 2 and 3 three times to bleed
the fuel system.
5.
Crank over the engine (for no longer than
15 seconds at a time) while monitoring
the fuel pressure/vacuum gauge.
Does the vacuum/pressure gauge ever
indicate a larger than the specified value?
5 inHg
Go to Step 9
Go to Step 10
9
1.
Inspect the fuel lines between the fuel
supply pump and fuel tank for being
crushed or kinked.
2.
Inspect the fuel tank vent hose for a
plugged or kinked condition.
3.
Inspect the fuel cap for a plugged or
kinked condition.
4.
Inspect inside the fuel tank (if possible)
for any foreign material that may be
getting drawn into the fuel line pickup
causing a blocked condition.
5.
Repair the condition as necessary.
Did you find and correct the condition?
—
Go to Step 18
Go to Step 14
Step
Action
Value(s)
Yes
No