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General Bobcat Skidsteer Forum
Model 630 Bobcat Fuel Supply Questions
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<blockquote data-quote="Tigerhaze" data-source="post: 57500" data-attributes="member: 6436"><p>Good morning-</p><p>I have a few fuel supply-related questions on a Model 630 Bobcat. I have been having issues with the engine cutting out when getting hot and have read that vapor lock might be an issue. I have checked when hot and am getting spark so don't think that is it. I took the time last weekend to disconnect all of the fuel lines and wrap them with insulation to see if that improves things.</p><p>During that exercise I noticed some bare wires exposed on the carb solenoid and the fuel shutoff solenoid so I replaed the portions I could get to with new connectors and wire. I also replaced the fuel shut off solenoid with a new one from Bobcat. After replacement the 630 would turn over but not start- I pulled the fuel line from the pump to carb and no fuel and the pulled the fuel fitting just after the shut off solenoid and turned the key and it appears that the solenoid is not energizing and allowing fuel to leave the tank by gravity. I shoud mention fuel filter is new so don't think it is clogged and it was leaking fuel when I put the new solenoid on.</p><p>I have the following questions:</p><p>1) I assume that there must be an open on the wiring to the shut off solenoid? Can I just jump 12V to it to see if it opens when energized? The solenoid says 30 watts so wasn't sure if jumping could short it. Also does anyone know where the positive wires to- the ingition switch? The wire it was connected to ran way up in fron of the motor so not sure the connection and the wiring diagram in the parts and service manuals doesn't appear to show it directly.</p><p>2) What is the purpose of the carb solenoid? The service manual does not appear to discuss and it seems it wouldn't be a shut off since there is a seperate fuel shut off solenoid. Could it be a cause of cutting out and should it be replaced? Also where does it wire- again didn't see on wiring diagram.</p><p>3) The service manual said vapor lock can happen if fuel pump pressure is too low- I haven't checked the presssure as I don't have a guage and tee but with a significant number of hours on the Wisconsin is it worth replacing the fuel pump anyhow and see if that helps?</p><p>Thank you in advance.</p></blockquote><p></p>
[QUOTE="Tigerhaze, post: 57500, member: 6436"] Good morning- I have a few fuel supply-related questions on a Model 630 Bobcat. I have been having issues with the engine cutting out when getting hot and have read that vapor lock might be an issue. I have checked when hot and am getting spark so don't think that is it. I took the time last weekend to disconnect all of the fuel lines and wrap them with insulation to see if that improves things. During that exercise I noticed some bare wires exposed on the carb solenoid and the fuel shutoff solenoid so I replaed the portions I could get to with new connectors and wire. I also replaced the fuel shut off solenoid with a new one from Bobcat. After replacement the 630 would turn over but not start- I pulled the fuel line from the pump to carb and no fuel and the pulled the fuel fitting just after the shut off solenoid and turned the key and it appears that the solenoid is not energizing and allowing fuel to leave the tank by gravity. I shoud mention fuel filter is new so don't think it is clogged and it was leaking fuel when I put the new solenoid on. I have the following questions: 1) I assume that there must be an open on the wiring to the shut off solenoid? Can I just jump 12V to it to see if it opens when energized? The solenoid says 30 watts so wasn't sure if jumping could short it. Also does anyone know where the positive wires to- the ingition switch? The wire it was connected to ran way up in fron of the motor so not sure the connection and the wiring diagram in the parts and service manuals doesn't appear to show it directly. 2) What is the purpose of the carb solenoid? The service manual does not appear to discuss and it seems it wouldn't be a shut off since there is a seperate fuel shut off solenoid. Could it be a cause of cutting out and should it be replaced? Also where does it wire- again didn't see on wiring diagram. 3) The service manual said vapor lock can happen if fuel pump pressure is too low- I haven't checked the presssure as I don't have a guage and tee but with a significant number of hours on the Wisconsin is it worth replacing the fuel pump anyhow and see if that helps? Thank you in advance. [/QUOTE]
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