Diesel JD
Full Access Member
Yeah it would be interesting, sometimes the condition Heath describes causes rough running and stalling at rock bottom rpm. The permanent fix is a rebuilt IP but many of us have gotten more mileage or extended the pump's life almost indefinitely by dosing it with a high dose of power service, howes or stanadyne lubricity formula. You could also check the large red wire and see if the wire or terminal for the FSS are loose.