Could someone tell me the serial numbers of the DS4 Pumps and if they are good?

The reason i ask is because i forgot to write the number down on my pump
thinking i could remember. NOT.

I think it was 5*49 but dont quote me on that.
Thanks

As long as it didn't say 5068, you can replace it with a 5521, if you are wanting to replace the pump. If it says any other number, the replacement pump # is 5521. But only a 5068 can replace a 5068. Don't quote me on it, but I do beleive 94 was the only year they used 5068, not totally sure, but if that is true, you shouldn't have to worry. Maybe someone with more experience can help some more if you need more information on it. I'm not very educated on these engines, lol. Hope this little bit of info helps!

DS4-S5459 That is the pump i got.
What do u guys think of it?

Only '94 F engines had the DS-4 5068.

was the 5068 pump any good? Im pretty sure thats what mine has

Only '94 F engines had the DS-4 5068.I have learned never to make that assumption and to verify what is actually installed as you never know what could have been swapped or carried over. In general, my suggestion is to move forward into the "mainstream" pumps as in 5288 and up whenever the opportunity presents itself.

The 5068 is nota bad pump, it is just an orphan that speaks a different language...

DS4-S5459 That is the pump i got.
What do u guys think of it?
Just as good as the 5521 with the exception that the 5521 had the travel limiter on the stepper motor. The stepper seldom fails anyhow.

I think, and this is just my thoughts, I don't know, that the deal with the travel limiter and 'updated' stepper motor was a cost cutting measure more than an improvement. Stanadyne probably found a cheaper supplier for their steppers because it didn't have an internal stop like the old ones did. They are both very reliable, I've only replaced a handful over the years out of hundreds of pump. The only real advantage, IMHO, to the travel limiter is it keeps fuel hoses etc. from interfering with the steppers operation.

5068 pumps aren't 'bad' persay, but look at this way, they made 2 different DS pumps in 1994, and the 5068 was discontinued, 5067 got updated... Stanadyne must have learned something to make them use the 5067 series right? But I will admit, the 5068 pumps 'seem' far less troublesome, but they are getting very rare.

Ok thanks John

5068 pumps aren't 'bad' persay, but look at this way, they made 2 different DS pumps in 1994, and the 5068 was discontinued, 5067 got updated... Stanadyne must have learned something to make them use the 5067 series right? But I will admit, the 5068 pumps 'seem' far less troublesome, but they are getting very rare.
THAT is what I would consider a cost cutting action. I believe they found that the 5067 can cover the application with a single pump model and different eproms...

No doubt, simplifying to one pump was first and foremost to reduce cost and confusion.

But as far as the stepper motors, you said it your self, they very very rarely fail, and I can't see them feeling to need to improve on such a proven piece.