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Post by Eric R on Mar 28, 2023 9:43:04 GMT
Why does fuel gauge accuracy fail? (I have replaced the P5 with aa NOS float!)
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Post by enigmas on Mar 29, 2023 0:40:05 GMT
Why does anything stop working Eric? It may be due to Entropy or Murphy's Law or plain neglect or the mechanism is past it useful life or even not understanding how a system works and bodgying the device.
Understand the principles of operation and in most cases the device can be made to function. The first port of call is to consult the relevant electrical wiring section of the WSM.
The sender in the tank delivers a signal to the gauge that based on it's position rubbing against an electrical resistor. The gauge in or under the dash receives the electrical signal and due to it's calibration indicates the fuel level somewhere in the vicinity of 0 to 100, empty, full or somewhere in between.
Check continuity in every connection and ground/earth for that system from the tank sender to the gauge/receiver. If it's not broken it'll function but wishing won't make it so. Be methodical and check each component and connection.
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Post by Phil Nottingham on Mar 29, 2023 20:47:33 GMT
Why does anything stop working Eric? It may be due to Entropy or Murphy's Law or plain neglect or the mechanism is past it useful life or even not understanding how a system works and bodgying the device. Understand the principles of operation and in most cases the device can be made to function. The first port of call is to consult the relevant electrical wiring section of the WSM. The sender in the tank delivers a signal to the gauge that based on it's position rubbing against an electrical resistor. The gauge in or under the dash receives the electrical signal and due to it's calibration indicates the fuel level somewhere in the vicinity of 0 to 100, empty, full or somewhere in between. Check continuity in every connection and ground/earth for that system from the tank sender to the gauge/receiver. If it's not broken it'll function but wishing won't make it so. Be methodical and check each component and connection. Very Good points - methodical is always the key - the gauge circuit in most P5s (post Mk1a) and all P5Bs has only 4 areas to cause trouble. The main one by far is the wiring e.g. corroded connections and poor earths, the sender can stick, the voltage regulator can fail open circuit or close circuit which will burn out the gauge windings on a full tank, otherwise the gauge is the most reliable part! Identify the faulty part and rectify |
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