Read on to learn the most common causes of broken gas gauges and how to identify them. This will usually cause the gauge to work only at certain times, usually when the fuel level is low. Before you begin testing your gas gauge, gather the following tools: an electrical wiring diagram (EWD), a digital multimeter (DMM), and basic hand tools. That float goes up and down with the fuel level, and has a rheostat that returns a corresponding amount of voltage to the gauge. Hey guys, I've got a few questions about my fuel gauge not displaying correctly. If the car starts and runs for any length of time, the pump is working fine. I think this was normal with the old pump but after cranking the needle would float to indicate the level of fuel in the tank. Check the wiring from the guage to the tank, and the earth . I took the truck and filled it with gas hoping it would have … The fuel pump module includes the fuel sending unit, used by the gas gauge to detect and display fuel level. Worked Fine When I Brought It In. change fuel pump and the problem happened. This isn't uncommon with aftermarket reman pumps. And while that may seem like a relatively minor inconvenience, running out of gas has several long-term consequences for your vehicle, including increased fuel pump wear and fuel pump … Fuel gauge not working after fuel pump replacement. Automotive Mechanic. Didn't know this at the time but it seems that the problem is because of MAPPS sensor type on the new pump. how can i fix this. I Performed A Test Using The Ignition And Trip Mileage Thursday, November 30th, 2006 AT 10:53 AM. The problem now is that the gauge is not working properly. Any ideas? TRY A LARGE MAGNET! He then replaced the new fuel pump 3 times pulled the gas tank twice and still cant fix it. M ... Also anyone have a how-to on the fuel pump replacement? The fuel float contacts run on a potentiometer, or variable resistor, whose resistance changes depending on float level, effecting a change in output voltage. 3. Fuel gauge not working properly. Discussion Starter • #1 • Feb 15, 2014. Want Answer 0. The gas gauge tells you how much fuel is in your gas tank and alerts you when it's time to refuel. Average repair cost is $440 at 71,250 miles. Did I blow fuel pump 15amp fuse? Ensure that all wiring connections (both on the back of the gauge and on the sender unit) are clean, tight, and free from dirt and corrosion. Does anybody know any good mechanics that deal with these type of repairs? Check the fuse in the circuit first. See the TSB for complete details. Jump to Latest Follow 21 - 39 of 39 Posts. Before I start the truck the needle my set about 1/4 tank and after cranking the needle will float behind empty where it remains. https://www.flickr.com/photos/crazyoctopus/4442635632, How Electronic Throttle Control (ETC) Works, Troubleshooting Common Condenser Fan Problems, Troubleshooting a No Spark Problem in Honda Accord, Understanding Diesel Glow Plugs and How to Replace Them, Cruise Control Not Working? So after installing my pagparts fuel pump recently which by the way is an amazing piece that is working well so far, my fuel gauge is not working. However, if the fuel gauge needle does its sweep as it is supposed to, you need to perform further tests to properly diagnose the problem. Posted by Oswaldo Ramirez on Dec 16, 2012. Had Fuel pump replaced due to failure between 85,000 and 90,000 miles. All of this indicates you need to go to a mechanic and get your fuel gauge checked or replaced soon. Other systems have opposite wiring (high fuel level corresponds to high resistance and low voltage) but nonetheless go through the same process. Hello. If that reads 12 volts, turn off the ignition. If the fuel pump is not coming on, and the fuse and relay are good, then it may be possible that there is a problem with the pump or the fuel pump circuit. 10 Posts . The guage itself, or the wiring, or the sender unit is defective. Fuel gauge not working... Jump to Latest Follow 1 - 9 of 9 Posts. Took it back to the mechanic and he said that the new fuel pump must be bad. If this happens, reset your fuel gauge. This is a common problem that any vehicle faces. The sending unit is usually part of the Fuel Pump Module: a combination of parts that includes the fuel pump, fuel strainer, fuel filter, and fuel float. The fuel pump has a float on it. disconnected negative side of battery before dropping tank to replace fuel pump. I tried the guage test thing (turning to on while holding the trip meter button) and the needle does travel fine so I am 99% sure it is in the sender itself. 2 Answers. Voltage to black wire on both sides are 4.9v. Issue was it was working right after fuel pump replacement. I Drove A Total Of About 50 Miles Stopping At... My Gas Gage Quit Working And My Fuel Light Comes On. The most obvious problem is due to the faulty fuses and connector wirings. I know this is an old post. My fuel meter when you turn the car on it goes to full and then slowly drops to zero. The fuel level sending unit on the replacement pump may be bad. If it does not, the issue is with the fuel gauge directly. If the gauge does not read at all, check the power with a multimeter at the gauge terminal. Before I start the truck the needle my set about 1/4 tank and after cranking the needle will float behind empty where it remains. Button And It Did What It Was... 1999 Dodge Ram Van With Just Under 61,000 Miles. Once all fumes have subsided, plug in the new fuel pump and reconnect the battery. There are some simple tests you can do to see if your fuel gauge is working. I replaced it because the truck stopped while driving and would not start afterwards. Some info on the rheostat: New Delphi: Empty 40ohms. When completed the truck started but my fuel gauge does not work. Sometimes it will show the correct level and most times usually at start up it shows empty. Then it went down to E from 3/4 in like 120 miles. Here are four ways that the gas gauge can fail. Full 250ohms. Orig Pump: Constant at 315ohms. All good. IT's possible that the pump was installed incorrectly and the sender is hitting the side of the tank. My GMT-400 Gen1 Vortec is having a bit of a stumbling issue that could either be the injection spider or fuel pump (I'm getting a fuel guage today to potentially eliminate the pump as part of the problem). Is there something I should have done or should do before I lower the tank and replace the new unit with the assumption that it is defective? I recently replaced the fuel pump assembley (the whole unit -- pump, filter, float.) I've learned from dealing with J and J Auto it's not an easy repair for some mechanics. The gas gauge in the instrument cluster is the visual indication of activity in the fuel tank and sending unit. The gas gauge is a relatively simple circuit, but its simplicity means each component is essential to its function. They are always working to improve the site. Anyways, after putting the new pump back in I started the car and noticed the fuel gauge reads empty all the time now. Some gas gauges are directly controlled by voltage feedback from the sending unit, while others are controlled by the instrument cluster, which itself gets voltage information from the sending unit. 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