How old is that pump? It looks like it had a seal fail and leaked methanol down into the pump. Methanol is very corrosive. How old is that pump?
That seal looks like the one only compatible with 50/50 methanol.
The attached pic is our custom pump with the 100% methanol seals which have been in use since Jan 07 /late 2006. The left is a standard
shurflo pump the middle is our and the right is a compeditors. The seal on the left if Viton not rated for more than 50/50
If they were running more than 50/50 with that type of seal then most likely failed.
I don't think there is any saving that unit due to the corrosion.
There is a tech article we will be posting with the breakdown of all the pumps piece by piece to show you the differences. But that seal is the reason for the pump failure. We do carry the 100% methanol compatible seals on the site for people to change them out but it's to late for that one.