Well, since you only have a quarter tank of (dear God I hope not gas.....) I would take the opportunity to drain the remainder out, and clean the tank strainer. Then I would change all the fuel filters, fill and prime with fresh fuel and see if that helps. Another question....when you remove the fuel cap to add fuel, do you hear a "whoosh" sound of air? If so, your tank vent is clogged and could easily cause your issue. I'm betting on filters though, but either way, draining the tank and cleaning the strainer and cleaning the tank vent are pretty well documented in other threads on the forum....Good luck and let us know the outcome.

__________________
2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)