Generac Power Systems MC User Manual

Page 32

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TEST 20;- FUEL LOCK-OFF SOLENOID

A.)- Locate Wire No. 14 between the

Fuel Lock-Off Solenoid and terminal

strip. Disconnect the wire at its

terminal strip connection. Crank en
gine. While cranking, touch Wire No.
14 to its terminal strip connection.

Fuel solenoid should actuate. If the

unit has an electric fuel pump, a

noticeable change in fuel pump sound
will be detected.

RESULT:- Solenoid did not actuate.,.,,............. Go to Paragraph B

Solenoid actuates....Continue tests in DIAGNOSTIC FLOW CHARTS

B.)- Disconnect Fuel Lock-Off Solenoid Wire No, 14 at the terminal st

rip, Set VOM to "+DC” and to ”Rxl” scale. Zero the meter. Connect one

meter test probe to the terminal end of Wire No, 14, Connect the rem

aining test probe to frame ground. Meter needle should swing upscale
to indicate resistance of solenoid windings.

RESULT:- Meter did not swing upscale,

.Check Wire No, 14 between sol

enoid and terminal strip for

open condition. Also check the

solenoid ground wire and conn
ection

.Replace Fuel Lock-Off Solenoid

Meter needle swung upscale,,,

and solenoid did not actuate

in Paragraph

TEST 21:- FUEL PUMP

UNITS WITH ELECTRIC FUEL PUMP

A.)- Disconnect Wire No, 14 at the Fuel Pump, Set VOM to ”+DC' and to

”Rxl” scale. Zero the meter. Connect one meter test probe to the Fuel

Pump Wire No, 14-, Connect the remaining test probe to frame ground.

Meter needle should swing upscale and indicate approximately 50 Ohms',

RESULT:- Pump tests good.......................... Go to Paragraph B

Pump test^ bad,...... ......................... Replace pump

C,)- Set VOM to "+DC" and to 50V scale. Disconnect Wire No, 14 at the
Fuel Pump, Connect POSITIVE (+) meter test probe to terminal end of Wire
No. 14, Connect COMMON test probe to frame ground. Crank the engine -

meter needle should deflect upscale and read approximately 12 Volts DC

(battery voltage),

RESULT:- Meter needle daes NOT swing upscale....... Go to Paragraph C

Meter indicated approximately 12 Volts.....Replace Fuel Pump

2.2-10