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    reley's Avatar
    reley Posts: 2, Reputation: 1
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    #1

    Feb 15, 2009, 08:06 PM
    1990 1500 Blazer Gas Tank Sending Unit
    1990 1500 Blazer... Gas gauge reads well above full and drops to 1/4 or 1/2 tank reading quickly... was told (bought used) that it is empty on 1/4 tank. How do I trouble shoot sending unit? Also, oil pressure gauge pegs when started but not when key on no matter if hooked to sending unit or not?
    dustyboner's Avatar
    dustyboner Posts: 4, Reputation: 1
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    #2

    Feb 16, 2009, 01:08 AM
    It's a common problem for the sending unit to read the fuel level incorrectly due to a defective module. You need to replace the sending unit (basically the sending unit is the whole fuel pump assembly minus the fuel pump). Napa has them for around $150
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Feb 16, 2009, 02:19 AM

    Sulfurs in non-Tier 1 gasoline can harm gas gauge sensors. Chevron's Techron Concentrate Plus is supposed to clean and protect against this problem in just 1 tankful.
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