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Caterpillar 3208 Solutions This sub-forum is hosted by Mike Hohnstein who has been at this kind of thing for 50+ years now, guess I'm addicted. The saga has been all about progressively larger shop space since then. Honestly, never wanted to get into the CAT 3208's that were originally considered to be a throwaway engine but that's all that works in a FC in my world. Same thing with my Ford toter, that came with a NA, too much effort to hang in a 6, so been at it with the CAT V-8 for 20 years now. In reality you can get excellent life out of a CAT 3208 if it's built correctly. Post your questions about the CAT 3208 engines here and Mike will try to help you out.

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  #1  
Old 10-12-2019
cwheeler76779 cwheeler76779 is offline
82 FC31 SB - Fort Worth
 
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Default Fuel Delivery Problem

About 6 week ago we made a trip. Bird ran as normal until the trip home. At stops it would start surging. We were helping our family relocate from Nebraska, so I did not get back to start checking until today. I was going to move it to the house, but it would not start. Not sputter, cough, nothing. I removed the fuel cutoff solenoid and the actuator was stuck down. I worked it up and down a few times but could not get it to free up. With the actuator up in the run position it still would not start. I loosened a injector line and there is no fuel flow. This is on a 1982 FC31 with a 3208NA. Thought I would check with the experts before I started trying to dig into the injector pump. Thanks for any help or ideas!
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Old 10-12-2019
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Fuel in the Tank?
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Old 10-12-2019
GEEZER GEEZER is offline
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Fuel filters
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Old 10-12-2019
cwheeler76779 cwheeler76779 is offline
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Tank is full, Used the primer pump to be sure there was fuel flowing out of the bleed valve on the injection pump.
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Old 10-12-2019
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If you have a fuel hand pump, start pumping to see fuel at the injectors,
need atleast three or four to start, probably a air leak, maybe the hand pump or the glass water separator, is you have those things. do you have a racor filter? they also can suck air
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Old 10-14-2019
cwheeler76779 cwheeler76779 is offline
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Thanks for all the replies. Today I plan to replace the filters. They were replaced in April and have about 470 miles on them, but for good measure I will replace them again. With the bleed valve on the injection pump open I get diesel out with the hand priming pump or when cranking. I feel that somehow this problem is related to the sticking fuel cut mechanism such as fuel gumming in the pump. I will keep all informed.
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Old 10-14-2019
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Randy Dupree Randy Dupree is offline
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I never change filters until the engine is running.
Run the engine and then change the filters,if you feel you need too.
Taking the filters off will make it lose its prime even more (possibly).
If you have a hand pump they are known to suck air too,it may have bad orings.
Or the rack may be stuck
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Old 10-14-2019
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Quote:
Originally Posted by cwheeler76779 View Post
Today I plan to replace the filters.
Make sure you check the fuel filter mounting stem, there is a rubber gasket with your filter and sometimes it will stay on the stem when you remove a filter. Then you install a new filter with another rubber gasket. The duplication will cause an air intrusion. Also check to see if you have a facet fuel pump, it could be on your street side frame rail or in that vicinity. It can be straight wired to get fuel forward,but it is normally wired into the oil sending unit. Mine was wired to the ignition switch. That way I could change out my racor and fill it with fuel. Good luck.
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Old 10-19-2019
cwheeler76779 cwheeler76779 is offline
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Update: Since the fuel shutoff would not move to the “ON” position today I removed the top of the injection pump with the help of my son. The fuel cutoff rack is stuck, I mean really stuck, I cannot move it. My son who was helping me said that the diesel did not smell right. I do not have any sense of smell so I would not know. It did not look like it had water in it. We sucked out the diesel and filled the pump up with diesel clean. I thought I would let that sit overnight and then remove it and see if the rack would move. If not, I do not know if I am in over my head or not. Any body know if the fuel cutoff rack can be removed with out any special tools to reinstall?
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Old 10-19-2019
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Fill the pump with Marvel Mystery Oil and let it soak.
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