Posted by dave horvath on Wednesday, December 11, 2002 at 1:37PM :
In Reply to: I have 2 types of fuel pumps? Plain one & Vacume type posted by Willy-N on Tuesday, December 10, 2002 at 11:53PM :
The combination fuel/vacuum pump was a rare option on later WM300's with the 215ci. Should work fine in place of the fuel pump on your 231. Others can verify.