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GM Code P1345
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<blockquote data-quote="GaryTJ" data-source="post: 911470" data-attributes="member: 16023"><p></p><p><span style="font-family: 'Arial'"> [ATTACH]9521[/ATTACH]</span></p><p> </p><p> </p><p> </p><p> </p><p><span style="font-family: 'Arial'">Correct fuel pump service on these vehicles requires a somewhat different approach with using:</span></p><p><span style="font-family: 'Arial'">1. <em>Current Draw</em></span></p><p><span style="font-family: 'Arial'"><em></em>Current draw may be viewed using the fuel pump test connector hooked with a jumper to battery positive and measured either using a multimeter or a current probe. We prefer to use the low current probe and view not only actual current draw but view pump waveform to confirm pump condition as well (see Figure 4).</span></p><p><span style="font-family: 'Arial'">2. <em>Fuel Pump Pressure</em></span></p><p><span style="font-family: 'Arial'"><em></em>Fuel pump pressure may be tested as usual (remember the tight specification shown above) and should be checked for pressure as well a leak down rate (see Figure 3).</span></p><p><span style="font-family: 'Arial'">3. <em>Fuel Pump Volume</em></span></p><p><span style="font-family: 'Arial'"><em></em>Fuel pump volume may also be tested using a conventional method of XX amount of flow in XX amount of seconds but we prefer to use the latest volume meter showing actual flow through a meter to determine the actual volume of the pump in gallons per hour - this unit must exceed 0.5 U.S. gallons per minute under all test situations.</span></p><p><span style="font-family: 'Arial'">This case study displayed good pressure and poor volume. Volume should be 0.5 gallons per minute for these vehicles.</span></p><p><span style="font-family: 'Arial'">4. <em>Fuel Pump Current Waveform</em></span></p><p><span style="font-family: 'Arial'"><em></em>Figure 4 shows a very good pump with a very smooth repetitive brush contact with motor commutator. Experience is required for this type of testing, but again, knowing what to look for is the key as well as viewing many pumps in your day-to-day service of vehicles. </span></p><p><span style="font-family: 'Arial'">Our experience has shown that this is the most correct method of analyzing the overall pump condition and determining, beyond a shadow of doubt, that the pump module does in fact have a problem and require replacement.</span></p></blockquote><p></p>
[QUOTE="GaryTJ, post: 911470, member: 16023"] [FONT=Arial][/FONT] [FONT=Arial] [ATTACH]9521.vB[/ATTACH][/FONT] [FONT=Arial] [/FONT] [FONT=Arial] [/FONT] [FONT=Arial] [/FONT] [FONT=Arial] [/FONT] [FONT=Arial]Correct fuel pump service on these vehicles requires a somewhat different approach with using:[/FONT] [FONT=Arial]1. [I]Current Draw [/I]Current draw may be viewed using the fuel pump test connector hooked with a jumper to battery positive and measured either using a multimeter or a current probe. We prefer to use the low current probe and view not only actual current draw but view pump waveform to confirm pump condition as well (see Figure 4).[/FONT] [FONT=Arial]2. [I]Fuel Pump Pressure [/I]Fuel pump pressure may be tested as usual (remember the tight specification shown above) and should be checked for pressure as well a leak down rate (see Figure 3).[/FONT] [FONT=Arial]3. [I]Fuel Pump Volume [/I]Fuel pump volume may also be tested using a conventional method of XX amount of flow in XX amount of seconds but we prefer to use the latest volume meter showing actual flow through a meter to determine the actual volume of the pump in gallons per hour - this unit must exceed 0.5 U.S. gallons per minute under all test situations.[/FONT] [FONT=Arial]This case study displayed good pressure and poor volume. Volume should be 0.5 gallons per minute for these vehicles.[/FONT] [FONT=Arial]4. [I]Fuel Pump Current Waveform [/I]Figure 4 shows a very good pump with a very smooth repetitive brush contact with motor commutator. Experience is required for this type of testing, but again, knowing what to look for is the key as well as viewing many pumps in your day-to-day service of vehicles. [/FONT] [FONT=Arial]Our experience has shown that this is the most correct method of analyzing the overall pump condition and determining, beyond a shadow of doubt, that the pump module does in fact have a problem and require replacement.[/FONT] [SIZE=3][FONT=Times New Roman] [/FONT][/SIZE] [/QUOTE]
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