{"id":14130,"date":"2023-01-20T07:48:03","date_gmt":"2023-01-20T07:48:03","guid":{"rendered":"https:\/\/www.cnautotool.com\/blog\/?p=14130"},"modified":"2023-01-17T10:52:30","modified_gmt":"2023-01-17T10:52:30","slug":"no-rail-fuel-pressure-low-fuel-pressure-event-code-spn-94-fmi-17","status":"publish","type":"post","link":"https:\/\/www.cnautotool.com\/blog\/no-rail-fuel-pressure-low-fuel-pressure-event-code-spn-94-fmi-17\/","title":{"rendered":"No Rail Fuel Pressure (Low Fuel Pressure) – Event Code SPN 94 – FMI 17"},"content":{"rendered":"

SPN94 FMI17 (C7 Engine)<\/strong><\/p>\n

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E198(1) Low Fuel Pressure –\u00a0The fuel pressure drops below\u00a0175 kPa\u00a0(25 psi)\u00a0for 10 seconds.
\nE198(2) Low Fuel Pressure –\u00a0The fuel pressure drops below\u00a0150 kPa\u00a0(22 psi)\u00a0for 15 seconds.<\/p>\n

#Probable Causes:<\/strong><\/p>\n

Fuel Supply
\nDiagnostic Codes and Event Codes
\nFuel Pressure Sensors
\nFuel Pressure Regulating Valve
\nFuel Priming Pump (if equipped)
\nFuel Transfer Pump
\nInjection Actuation Pressure<\/p>\n

#Recommended Actions:<\/strong>
\n1). Fuel Supply
\n\u2192Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the Engine has been run out of fuel, it will be necessary to prime the fuel system.
\n\u2192Check the fuel lines for the following problems: restrictions, collapsed lines and pinched lines. If problems are found with the fuel lines, repair the lines and\/or replace the lines.
\n\u2192Check the fuel tank for foreign objects which may block the fuel supply.
\n\u2192Prime the fuel supply system if any of the following procedures have been performed:<\/p>\n

Replacement of the fuel filters
\nService on the low pressure fuel supply circuit
\nReplacement of unit injectors<\/p>\n

\u2192Check fuel flow after the fuel filters. If the fuel flow is low, replace the fuel filters.
\n2).\u00a0Diagnostic Codes and Event Codes
\n\u2192Connect Cat ET to the service tool connector. Check for active Diagnostic Codes and Event Codes.\u00a0Look for active Diagnostic Codes that are related to the low pressure fuel system.\u00a0Read More:\u00a0How to Connecting Caterpillar ET Software to the ECM<\/a>.<\/p>\n

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3). Fuel Pressure Sensor
\n\u2192Start the Engine. In this case, Engine cranks but doesn’t STARTS (Fuel Pressure: 2-42 Psi).
\n\u2192Use Cat ET to monitor the “Fuel Pressure” for the Engine. Ensure that the value of the parameter is reasonable.\u00a0Read More:\u00a0Status Tool on Caterpillar ET Software.<\/a><\/p>\n

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\u2192If a problem with the sensor is suspected, replace the suspect sensor.<\/p>\n

4). Fuel Pressure Regulating Valve
\n\u2192A Fuel Pressure Regulating Valve that is stuck in the open position may cause low fuel pressure. If a problem with the valve is suspected, the problem is probably caused by contamination or debris lodged between the valve and the valve seat. Remove the valve assembly from the fuel filter base. Inspect the valve assembly for contamination or debris. Clean any contamination or debris that may keep the regulating valve open. If debris is present, find the source of the contamination.
\n\u2192If the Fuel Pressure Regulating Valve is the suspected cause of the low fuel pressure, replace the valve assembly.<\/p>\n

5). Fuel Priming Pump (If Equipped)
\n\u2192The electric Fuel Priming Pump is used to prime the low pressure fuel system. Ensure that the electric Fuel Priming Pump is achieving the correct pressure.<\/p>\n

6). Fuel Transfer Pump
\n\u2192The Fuel Transfer Pump may not be pumping an adequate volume of fuel in order to maintain the correct pressure in the low pressure fuel system. If the correct pressure in the low pressure fuel system is not maintained during start-up the Engine will start, but the Engine will not continue running.
\n\u2192Use Caterpillar ET<\/a> to monitor the “Fuel Pressure” status parameter during Engine starting. Read More:\u00a0Real Time Graphing using Caterpillar ET Software<\/a>.<\/p>\n

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\u2192If the other components in the fuel system are operating within specifications, and the fuel pressure decreases after starting the Engine, replace the Fuel Transfer Pump.<\/p>\n

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7).\u00a0Injection Actuation Pressure
\n\u2192Check the Engine oil level. Engine oil supplies the Injection Actuation Pressure circuit. The Engine oil must be kept at the proper level for fuel injection.
\n\u2192If service has recently been performed on the Engine, air may be present in the Injection Actuation Pressure circuit. Allow the Engine to fully warm up and operate the Engine under load in order to purge the air from the Injection Actuation Pressure circuit.
\n\u2192Check the Injection Actuation Pressure. Read More:\u00a0Injection Actuation Pressure Test using Caterpillar ET Software<\/a>.
\n\u2192Check the operation of the Injection Actuation Pressure control valve.<\/p>\n","protected":false},"excerpt":{"rendered":"

SPN94 FMI17 (C7 Engine) E198(1) Low Fuel Pressure –\u00a0The fuel pressure drops below\u00a0175 kPa\u00a0(25 psi)\u00a0for 10 seconds. E198(2) Low Fuel Pressure –\u00a0The fuel pressure drops below\u00a0150 kPa\u00a0(22 psi)\u00a0for 15 seconds. #Probable Causes: Fuel Supply Diagnostic Codes and Event Codes Fuel… Continue Reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":14131,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2036,748],"tags":[103,1033,528,752,751,1096,1034,753],"_links":{"self":[{"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/posts\/14130"}],"collection":[{"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/comments?post=14130"}],"version-history":[{"count":3,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/posts\/14130\/revisions"}],"predecessor-version":[{"id":14151,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/posts\/14130\/revisions\/14151"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/media\/14131"}],"wp:attachment":[{"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/media?parent=14130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/categories?post=14130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cnautotool.com\/blog\/wp-json\/wp\/v2\/tags?post=14130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}