Re: Fuel Pressure retaining valve
Posted by:
SSsssteamer (IP Logged)
Date: July 20, 2009 04:18PM
In reading the 1917 operator's manual, I now see that they still used the pressure retaining valve through 1917. The pressure retaining valve is used to retain the fuel pressure in your main fuel pressure bottles while parked. If the pressure retaining valve is not turned off while parked, the fuel pressure can leak backwards through the fuel pumps leaving your fuel system vapor locked. With hot fuel lines, gasoline can vaporize and as a vapor, can leak backwards through the fuel pump ball check very easily. If the Stanley is to be parked anymore than 5 minutes, the fuel pressure retaining valve should be turned off. To go again, it has to be turned back on, or all fuel pumped will be bypassed back into the main fuel tank. The later model 735 had two pilot/main hand air valves located under the toe board. Between these an air hose was attached to charge the fuel systems. The later model 735's came with an air storage tank from which a third valve located between the two former valves was used to supply the air to the two fuel systems. On the later model 735s, the three valves were located at your heel board. The hand air valves are not to be confused with the fuel pressure retaining valve, as they are for different uses. Why did the model 735 Stanleys and later discontinue the fuel pressure retaining valve? I think that it was because that they didn't have problems with the kerosene vapor locking the fuel system like they did with gasoline on the earlier single fuel systems. Why do you think that they discontinued the "pressure retaining valve"? :-)
Edited 2 time(s). Last edit at 07/21/2009 07:56PM by SSsssteamer.