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#91474 03/22/2004 12:02 AM | Joined: May 2003 Posts: 213 'Bolter | | 'Bolter Joined: May 2003 Posts: 213 | I looked today to see for sure. Key on, key off, tank full, tank empty, the gauge shows empty. Where do I start. I've been told I will need a runtz in the system. Will I need a new gauge first, or what? Any lines of what to try A, B, C, D? Where do I get the runtz when I need it?
Thanks in advance to the helpful ones who will weigh in. | | |
#91475 03/22/2004 12:38 AM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Jake,
Search in this forum (upper right, under Post Reply and Post New Topic) for "gas gauge" and then "fuel gauge". There are a lot of good advice and diagnostic procedures in old posts.
First you should check the gauge enclosure ground. If the enclosure and gauge are well-grounded, a working gauge should show a non-empty reading (unless your gas tank is empty).
The following things need to be tested (a search will give explanations on how to test) and I would test them in this order:
1. Poorly grounded gauge enclosure. If the gauge is good and the ground is good, the gauge should read correctly or it will spike to full. If it spikes to full, then test for the following.
2. Poorly grounded sender unit in the gas tank.
3. Bad sender lead.
4. Bad sender unit.
5. Poor ground between gauge and enclosure.
6. Bad gauge
Make sure the power lead to the gauge is good.
Of course, if you have a 12 volt system that never used a resistor (Runtz or otherwise), your gauge might be fried.
Tim | | |
#91476 03/22/2004 6:06 PM | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | If you are talking about a stock AD truck, your gas gauge is a small ammeter. What that means is that the sender in your tank is a varaible resistor that determines how much current flow there will be and thus how much your gauge will register. If you jumper the tank sender to ground at the tank, your gauge should read full. The gauge wiring is not fused or protected in any fashion so it is not a fuse problem or circuit breaker problem. | | |
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