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The truth of the matter is fuel (gas&diesel) does not hold up like it used to. Gas now days can deteriorate in a matter of days making it prone to leave deposits.
My anecdote which really ended in surprise was convincing enough for me. I have a golf cart which I have used daily for 12 years. This Summer it started to hesitate and I expected the reason was lack of spark. I was all set to replace the ignition coil because I tried new plugs and it did not help a bit. Someone suggested try a squirt of SeaFoam first. They were experienced and suspected my problem was fuel supply not electrical.
Well, I put a couple of oz. of Seafoam in a tank of gas. The cart immediately started running worse with twice the engine hesitation when I attempted to accelerate. I blamed the Seafoam. I also went ahead and replaced a small ceramic filter below the engine I did not even know existed for the 12 years of use.
That was all the cart needed. The thing has run excellent ever since. The sea foam had actuallly worked but the gas lines and filter system were so cruddy the Sea Foam broke all that stuff loose and this finished off that little ceramic filter. Regular use of that stuff I believe would have prevented that gas from leaving all the extra sludge at once.
Walmart sells sea foam but they also sell a competing brand which is half as much in cost. For the same $9.00 for something like an 8 oz. or 16 oz. can of SeaFoam you can buy twice as much of that generic stuff. I dont know if it is as good but it could be. The generic I speak of might be called Lucas brand if my memory is correct.
That story I experienced did it for me. Sea Foam works.
rimshot