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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
742/743 Fuel Pump Clicking
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<blockquote data-quote="onepoket" data-source="post: 109590" data-attributes="member: 18152"><p>Ok, here is the update. </p><p></p><p>I got a bunch of diodes from Microcenter figuring one of them has got to work, the pack has all types silicon, zener, etc. </p><p></p><p>I tried wiring a silicon diode between the positive (which comes from the key run terminal) and the negative which was connected to the grounding lug on the engine. The first time I connected the + side of the diode to the + wire from the key to pump and obviously the - side of the diode to the ground wire. This caused the diode to explode essentially. I turned the key to run and I didn't immediately hear the pump start clicking, I heard a small pop within 1 second and then the pump started clicking. I looked in the engine bay to find the small parts scattered about. </p><p></p><p>The second try I wired the diode the other way around, this caused the diode to smoke but it never exploded. I turned it on for maybe 1 second and when I didnt hear the pump I turned it off. </p><p></p><p>So, I gave up and tried to rewire using a second relay. The first relay that was in the dash was not connected to the pump at all, the switched side of the key goes directly to the pump. Furthermore the dash relay was wired backwards where 87 and 30 were switched but the fuse was still on the 30 side. So, at first I was confused where the battery was coming from but then figured out what was going on. I fixed the goofy wiring and put the fuse where it should be on the battery side. This relay now only powers the switches that control my front and rear lights and two other switches that are currently not used. </p><p></p><p>In the engine bay I mounted a relay on the side of the frame and hooked it up to the pump, taking battery off of the solenoid that isn't the glow plug one. Basically that wire comes from battery->crank motor solenoid->solenoid under air cleaner. I used the wire that came off the key run position to trigger the relay. This works as expected. </p><p></p><p>The problem has been sort of fixed, the lights dont strobe anymore but they do pulse in intensity somewhat. I feel like there is somewhere I could wire a diode to smooth out the voltage when the pump ticks so that I can remove the pulsing. </p><p></p><p>Any thoughts on what type and where to put a diode that will accomplish this?</p></blockquote><p></p>
[QUOTE="onepoket, post: 109590, member: 18152"] Ok, here is the update. I got a bunch of diodes from Microcenter figuring one of them has got to work, the pack has all types silicon, zener, etc. I tried wiring a silicon diode between the positive (which comes from the key run terminal) and the negative which was connected to the grounding lug on the engine. The first time I connected the + side of the diode to the + wire from the key to pump and obviously the - side of the diode to the ground wire. This caused the diode to explode essentially. I turned the key to run and I didn't immediately hear the pump start clicking, I heard a small pop within 1 second and then the pump started clicking. I looked in the engine bay to find the small parts scattered about. The second try I wired the diode the other way around, this caused the diode to smoke but it never exploded. I turned it on for maybe 1 second and when I didnt hear the pump I turned it off. So, I gave up and tried to rewire using a second relay. The first relay that was in the dash was not connected to the pump at all, the switched side of the key goes directly to the pump. Furthermore the dash relay was wired backwards where 87 and 30 were switched but the fuse was still on the 30 side. So, at first I was confused where the battery was coming from but then figured out what was going on. I fixed the goofy wiring and put the fuse where it should be on the battery side. This relay now only powers the switches that control my front and rear lights and two other switches that are currently not used. In the engine bay I mounted a relay on the side of the frame and hooked it up to the pump, taking battery off of the solenoid that isn't the glow plug one. Basically that wire comes from battery->crank motor solenoid->solenoid under air cleaner. I used the wire that came off the key run position to trigger the relay. This works as expected. The problem has been sort of fixed, the lights dont strobe anymore but they do pulse in intensity somewhat. I feel like there is somewhere I could wire a diode to smooth out the voltage when the pump ticks so that I can remove the pulsing. Any thoughts on what type and where to put a diode that will accomplish this? [/QUOTE]
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742/743 Fuel Pump Clicking
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