Had Fuel pump replaced due to failure between 85,000 and 90,000 miles. Some members drive around with a stick to dip their petrol tank, others rely upon the number of miles travelled and refuel accordingly, and run out of fuel on the road!, Others look for a replacement gauge at auto-jumbles. Any ideas? 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. Test between the positive terminal on the fuel gauge and a good ground; the reading should be 12 volts. I put a new fuel pump in. 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 resistance wire in the sender is broken. Hello. The gas gauge circuit connects the battery, sending unit, gas gauge, and ground. These steps should reveal the problem, but be wary of modern computer-controlled instrument clusters and gas gauges, which can be confusing to diagnose and repair. Unfortunately, most cars don’t come with a fuel pressure inspection port anymore (it was pretty common with cars made in the 60s-70s). Anyway, while researching I noticed that most 3rd party replacement fuel pumps contain a new wiring harness. Then crank the car over and see if it starts. Fuel Gauge - Working or Not? Want Answer 0. Took it back to the mechanic and he said that the new fuel pump must be bad. https://www.flickr.com/photos/3ndymion/33556245572, How to Identify the Source of a Gas Gauge Problem. Level 3: An expert who has achieved level 3 by getting 1000 points. 1 Answer. 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. The system thus outputs higher voltage at high fuel level, gradually dropping voltage as fuel level drops. A fault in one or more of these parts will lead to gas gauge failure. Want Answer 0. … Electronic and software malfunctions may cause the fuel gauge in your automobile to inaccurately measure or display the amount of fuel remaining in the gas tank. The fuel gauge in your automobile indicates the amount of fuel that remains in the gas tank. There is usually a black or yellow wire securing the connector of … If the sending unit arm got bent when installing it then it will bind up on the metal anti slosh plates inside the fuel tank. You will need to When completed the truck started but my fuel gauge does not work. The gas gauge tells you how much fuel is in your gas tank and alerts you when it's time to refuel. Interruption in the ground for either the gauge or the fuel sender might cause the issue too. Put it near the needle and see if it loops around back to the normal area.I fixed my Fuel Gauge !I had the problem. Now checked fuses 10 34 and 43. I Performed A Test Using The Ignition And Trip Mileage I've learned from dealing with J and J Auto it's not an easy repair for some mechanics. The most obvious problem is due to the faulty fuses and connector wirings. The original pump still worked, but my fuel gauge did not. Hey guys, I've got a few questions about my fuel gauge not displaying correctly. Replace the top cover and foam seal. I took the truck and filled it with gas hoping it would have some effect on the new float in the tank and make my fuel gauge start working but it still did not work. Anyways, after putting the new pump back in I started the car and noticed the fuel gauge reads empty all the time now. I Filled My 2003 Dodge Ram 1500 Quad Cab 4x4 With Gas And The Gas Gauge Was Working Fine. Remove the guage, and check how it responds to voltage. Fuel gauge not working after fuel pump replacement. Sorry for the late reply. 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. I took care not to damage the float when inserting the new unit in the fuel tank. disconnected negative side of battery before dropping tank to replace fuel pump. Then, run through the following tests to determine the source fo the problem. If it isn’t, check the ignition circuit. Cluster test shows good. Most modern sending units are grounded to the electrical system, but some older cars were grounded to the body or frame. Jump to Latest Follow 21 - 39 of 39 Posts. My 2004 Dodge Ram 1500 Quad Cab 4x4 Is Having An Electrical Issue. Average repair cost is $440 at 71,250 miles. He then replaced the new fuel pump 3 times pulled the gas tank twice and still cant fix it. If the wiring for that float is loose, or if the float got stuck in position when the pump was installed, then the gauge will not be accurate. 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. Ford has issued out TSB 4-21-15 for an erratic fuel gauge. The fuel gauge worked with the old unit. Does anybody know any good mechanics that deal with these type of repairs? I replaced it because the truck stopped while driving and would not start afterwards. There are some simple tests you can do to see if your fuel gauge is working. Button And It Did What It Was... 1999 Dodge Ram Van With Just Under 61,000 Miles. Other systems have opposite wiring (high fuel level corresponds to high resistance and low voltage) but nonetheless go through the same process. This will usually cause the gauge to work only at certain times, usually when the fuel level is low. Hello all! If the car starts and runs for any length of time, the pump is working fine. 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. Other reasons could be corrosion or loose connections at the fuel pump module. Repeat to self, “The electrical wiring diagram is your friend and can help you fix a broken gas gauge.”. I am planning on selling the car hopefully soon so I would like to get this issue solved as it is the only thing wrong with the car. 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. When you were installing the fuel pump module back into the fuel tank you may have inadvertently bent or damaged the the fuel gauge sending unit. Running low on fuel can also cause the fuel pump to pick up sediments, which clog the fuel filter, fuel injectors, or high pressure fuel pump. 11 years of experience. The guage itself, or the wiring, or the sender unit is defective. If your gas gauge is not working, the inaccurate information it provides may cause you to run out of gas unexpectedly. The fuel pump module includes the fuel sending unit, used by the gas gauge to detect and display fuel level. The gas gauge system can be broken down into three basic parts: gauge, sender, and circuit. I Drove A Total Of About 50 Miles Stopping At... My Gas Gage Quit Working And My Fuel Light Comes On. Fuel Pump Replacement: $120.92 - $1182.22: Get a Quote: Eduardo Ruelas. After I got the truck back and filled the gas tank I noticed the fuel gauge wasn't reading correctly. Some systems are wired so that high fuel level contacts the low-resistance section, gradually increasing resistance as fuel level drops. Also, when the directional light switches on or off, there will be a slight sound or change in pitch from the fuel pump. 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 overheating. 2 Answers. Orig Pump: Constant at 315ohms. 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? Posted by Oswaldo Ramirez on Dec 16, 2012. 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). All of this indicates you need to go to a mechanic and get your fuel gauge checked or replaced soon. Hello all hope you can help. 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. Comment; Flag; More. All good. 2 I went and filed up the car. Fuel gauge not working... Jump to Latest Follow 1 - 9 of 9 Posts. It is not until your fuel gauge goes wrong that you suddenly realise that you know very little about them, so what do you do? 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 … Did I blow fuel pump 15amp fuse? Worked Fine When I Brought It In. I could also see the gauge move a bit while driving. The fuel gauge worked with the old unit. When completed the truck started but my fuel gauge does not work. Then it went down to E from 3/4 in like 120 miles. Check the wiring from the guage to the tank, and the earth . If the fuel gauge reads full at all times, the probable causes are: • The wire between the sender and gauge is broken and/or the connections are not good. Voltage to black wire on both sides are 4.9v. Posted by pmp1369 on Aug 14, 2011. replaced fuel pump, now gas gage not working properly showing full tank all the time. In my 1991 Dodge Ram 150 (318 engine). In the future hope you don't have any vehicle issues, but, if you do, keep the site in mind. The fuel pump has a float on it. The gas gauge in the instrument cluster is the visual indication of activity in the fuel tank and sending unit. The fuel level sending unit on the replacement pump may be bad. Input voltage, typically from the ignition circuit, is modified by the fuel sender. They are always working to improve the site. Here are four ways that the gas gauge can fail. Clicking this will make more experts see the question and we will remind you when it gets answered. Fuel gauge is not working properly. Fuel gauge not working properly. 3. I don't want to run the tank dry and risk having to replace the fuel pump again. Didn't know this at the time but it seems that the problem is because of MAPPS sensor type on the new pump. I recently replaced the fuel pump assembley (the whole unit -- pump, filter, float.) Check the fuse in the circuit first. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. Once all fumes have subsided, plug in the new fuel pump and reconnect the battery. It was reading but only showed 3/4 tank when I topped it off. Before you begin testing your gas gauge, gather the following tools: an electrical wiring diagram (EWD), a digital multimeter (DMM), and basic hand tools. If your gas gauge isn't working, it's important to identify the source of the issue, then make a plan for repair. This is a common problem that any vehicle faces. 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