The money saved at "rustic" fuel docks sometimes isn't worth it. If you suspect fuel trouble, idle the engines and select a course that won't roll the peanut butter out of a jar, and then check each clear Racor fuel filter bowl with a flashlight. Diesel fuel should be clear amber or red; if it resembles diluted milk, there is water in the fuel which could quickly damage the engine. With or without water in the bowl, if engines won't turn cruising rpm, fuel filters need to be changed. Generator pickups are usually higher in the fuel tank, so they likely will be okay for a while. Before opening filters, make sure priming pumps work, and know how to use them, since diesels won't tolerate even a little air. Shut down the worst engine first (to maintain headway with the other), and open the valve on the bottom of the fuel filter, draining the water into a fuelresistant container. Close the valve, fire up the engine, and check the other side. Shut off the fuel supply valve, replace the fuel filter, cover gasket, and "T-handle" O-ring. Run that engine for a while to ensure it primed before stopping the other. On engines that use 10-micron filter elements (blue for the Racor brand), the secondary filters mounted on the engine should be fine for a while. Since red Racor elements filter to 30 microns, some debris will pass through to those 10-micron secondary filters. Head to a close port or be prepared to change those, too.