JoeR Posted February 15, 2011 Report Share Posted February 15, 2011 Hello, I am new to this forum. I have an 85 720 with 84k original miles on it. Mechanically the truck is in great shape but I have been having a weird problem where the engine dies when I have a full tank of gas on a downhill slope. I have been thinking its either the fuel filter or the carb. Any thoughts? Quote Link to comment
datzenmike Posted February 15, 2011 Report Share Posted February 15, 2011 When running properly on the level, move the air filter housing just enough to see the fuel level sight glass. It's a round glass bull's eye with a dot in the center. The fuel level should be near the middle. Possibly your float may be set too high and the carb is over full. Tilting the truck down hill raises the full tank higher and increases the fuel pressure and floods the carb and it stalls. A fuel filter change is always good to do every year or so, no harm in that, but it won't cause this problem. Quote Link to comment
JoeR Posted February 16, 2011 Author Report Share Posted February 16, 2011 Ok cool, when it stops raining, I'll check the carb. Where is the said sight glass and how does one go about adjusting it? Thanks! Quote Link to comment
datzenmike Posted February 16, 2011 Report Share Posted February 16, 2011 The sight glass is on the very front of the carb. Quote Link to comment
JoeR Posted February 16, 2011 Author Report Share Posted February 16, 2011 According to my Chilton manual, the float chamber is behind the sight glass window. Do I just bend the float so it sits correctly? Quote Link to comment
Sealik Posted February 19, 2011 Report Share Posted February 19, 2011 According to my Chilton manual, the float chamber is behind the sight glass window. Do I just bend the float so it sits correctly? You shouldn't have to bend the tab on the float....if...it hasn't been touched before. Usually there will be crud in the carb filter and or the needle/seat/chamber Quote Link to comment
ggzilla Posted February 19, 2011 Report Share Posted February 19, 2011 Many floats are not set correctly. If you need to set it, bend the tab carefully with needle-nose pliers. Do not bend the float. Quote Link to comment
datzenmike Posted February 19, 2011 Report Share Posted February 19, 2011 This may not be practical but if you turn the carb upside down the float will drop of it's own weight and the top of the float should be level with the top of the float chamber when adjusted correctly. Quote Link to comment
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