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Old 29-01-2020, 01:20   #16
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Re: Perkins 4-108 Anti-Stall Adjustment

If that little piston #7 gets stuck it might cause the problem youíre having with the anti stall valve
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Old 29-01-2020, 10:07   #17
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Re: Perkins 4-108 Anti-Stall Adjustment

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Originally Posted by lastkahuna View Post
My problem seems to be that at any setting of the anti-stall device all the way up down or infinite in-betweens same thing runs just a spurt and stalls. But as mentioned with it loose enough to drip fuel it runs and the lock nut becomes a throttle adjustment. A guy very familiar with diesels but not my model, a long time boat Captain said whatever the situation with the fuel flow in a closed system if there is fuel that I must have an air leak somewhere? he said that it may be to tiny to see at some fitting and even though at the anti-stall it looks like way to much pretty bubble-free fuel; that after tightening the lock nut air must be getting sucked in somewhere otherwise it would run? It is very logical. everything seems tight and drip and air free and it runs like new with the anti stall screw lock nut loose enough to drip fuel? Still wondering what to do next
Set the anti stall to approx my above settings. What else did you do to the engine? Filter replacement? Pull any lp lines? If you suspect an air leak check all the rubber olives on your filter housing and lift pump. Insert a clear length of hose before your lift pump and pull fuel into a bucket etc. Double check to make sure you didnít add a second gasket to your filter or didnít install the o ring. I would install an inline fuel pulp to make this easier as well. Report back
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Old 30-01-2020, 00:16   #18
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Re: Perkins 4-108 Anti-Stall Adjustment

Ok, I will report back, yes I replaced the water separator and fuel filter. It ran like a jewel before I did this... I am going to do what you suggested. Not running I understand but running good and not leaking except if the anti-stall is loose I do not understand but I will report back the clear line is a good idea so I can see if there are any bubbles.
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