Question about Cars & Trucks
Can you identify or remember which pipe on the sending unit, the pump module, is the main outlet from the pump?
The three lines are the main feed or pressure line to the engine, the return line from the engine to the tank-this line is often smaller than the main line. And the third line is not a fuel line, but the vent line for fumes from the enclosed tank to the charcoal canister. This line may be identifiable by pipe diameter being smaller, or sometimes using rubber hoses with it, or maybe just a little offstanding from the other two lines. The main line (pressure line) will be the line that has the fuel filter in it. You can identify the main line this way, then just figure out where it connects onto the tank, and sort out the other two lines-the return line and the (?smaller?) vent line.
Posted on May 08, 2017
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Posted on Jan 02, 2017
SOURCE: fuel gage sending unit
I have a 1991 Ford F-250 with dual gas tanks. When I turn the ignition on there is no power to the fuel sending uhit. You cannot hear the unit when the key is turned on, therefore the vehicle will not start. While attempting to check for power I grabbed the frame and the I could hear the unit click on. I drove the vehicle and upon parking the vehicle I shut the ignition off and the problem occurred again. Seems to me there is a short somewhere, but what is the best solution.
Posted on Sep 22, 2008
Make sure you have the lines attached correctly on the sending unit and make sure there no small holes in the line. The pump pulls fuel and will draw in air. To make sure the pump is good, attach the tank side to a container of fuel and see if the engine starts. (keep the container below the pump or it can start a siphon and appear to be OK when it's not)
If the repair to the sender involved soldering up a line leak, make sure the line is not still leaking and that the line has not filled with solder.
It's a really simple system...there are no "trick" items there. If everything is intact and the pump is good, it has to work!!!
Posted on Jun 10, 2010
Your ecu is most likely the problem if it is bad it wont send power to the fuel pump. You can check it by turning on the ignition then listen for noise coming from fuel tank. You should be able to hear the fuel pump come on.
Posted on Aug 14, 2012
One is vapor, the other is pressure and the last is return line
Posted on Sep 18, 2012
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