Cessna 150 and 152 Fuel Indication: Senders, Gauges and Capacity Markings
A Cessna 150/152 fuel-quantity concern can involve the sender and gauge system, the tank-capacity markings, or the documented tank configuration. Those are different questions. The retained issue records distinguish Stewart-Warner indication equipment from a serial-specific 152/A152 capacity-marking discrepancy. Correcting one does not automatically establish the other.
Indication equipment has its own identity
The fuel-indication record points to SEB99-18 Revision 1 and an affected indicating configuration. It describes a service-bulletin concern involving inspection or correction of components, rather than a universal statement that every aircraft bearing a 150 or 152 model name has the same sender. Reims applicability remains dependent on the installed system and publication scope.
| Reference family | Issue ID | Category | Title | Failure Mode | Affected Scope | Applicability Class | Severity | Operational Consequence | Detection / Prebuy Clues | Maintenance / Mitigation | Legal / OEM Status | Primary Source Ref | Reference | Prebuy Priority | Confidence | Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cessna 150 | KI-025 | Fuel Indication | Fuel quantity indication accuracy/reliability | Stewart-Warner fuel quantity indication components can require inspection/correction. | 150/A150/152/A152 and other equipped aircraft; Reims applicability depends on installed system/publication. | CONFIGURATION | MEDIUM | Incorrect fuel quantity indication can contribute to fuel-management error. | Compare gauges/senders with actual fuel state; review SEB99-18 compliance and sender/instrument configuration. | Inspect/correct system per SEB99-18 and approved component data. | OEM mandatory-label service bulletin | SEB99-18 Rev 1 | [1] | HIGH | MEDIUM-HIGH | Do not confuse approval for replacement senders with proof of installation. |
| Cessna 152 | KI-025 | Fuel Indication | Fuel quantity indication accuracy/reliability | Stewart-Warner fuel quantity indication components can require inspection/correction. | 150/A150/152/A152 and other equipped aircraft; Reims applicability depends on installed system/publication. | CONFIGURATION | MEDIUM | Incorrect fuel quantity indication can contribute to fuel-management error. | Compare gauges/senders with actual fuel state; review SEB99-18 compliance and sender/instrument configuration. | Inspect/correct system per SEB99-18 and approved component data. | OEM mandatory-label service bulletin | SEB99-18 Rev 1 | [1] | HIGH | MEDIUM-HIGH | Do not confuse approval for replacement senders with proof of installation. |
| Cessna 152 | KI-047 | Fuel / Placards | Fuel-tank capacity marking discrepancy | Specified 152/A152 aircraft require corrected fuel capacity markings. | 152 S/N 15283592-15284627; A152 S/N A1520879-A1520952. | SERIAL RANGE | MEDIUM-HIGH | Fuel planning error / incorrect usable-capacity information. | Verify serial applicability and placard/marking correction. | Correct markings per AD. | FAA AD - mandatory | AD 81-05-01 | [2] | HIGH | HIGH | Records/placard issue can affect operational planning. |
A replacement-sender approval is evidence that a described installation may be eligible under its terms. It is not proof that the sender is installed in the aircraft being researched. Find the installation entry, identify the equipment and connect it to the applicable documentation. This is particularly useful when an aircraft's panel has been changed since its original handbook was issued.
Capacity markings are a separate problem
The KI-047 record identifies 152 serials 15283592-15284627 and A152 serials A1520879-A1520952 in relation to capacity markings. Its source reference is AD 81-05-01. That record concerns the stated capacity information; it should not be described as a gauge-calibration rule or a tank-size conversion.
For a buyer, compare the aircraft's placards, tank configuration documents and fuel-system work entries. A corrected marking does not show that a sender has been replaced. A sender replacement does not show that a capacity marking has been corrected. Keep both evidence trails when they are relevant to the particular aircraft.
Total fuel, usable fuel and displayed quantity
The fuel-capacity comparison separates total and usable capacity and preserves the standard and long-range tank arrangements. Those capacities describe the approved configuration. A gauge indication is an observation from an installed system, not an independent certificate of tank capacity.
The broad fuel-system guide identifies the relationship between tanks, indication, venting and supply. It does not provide a numerical accuracy tolerance for every sender or a procedure for determining fuel on board. Such limits and procedures need the correct operating and maintenance information.
Resolving conflicting sales information
If an advertisement, panel marking and handbook quote different capacities, record the disagreement instead of selecting the largest number. Establish which tank arrangement is documented and whether the quoted figure is total or usable fuel. Then review the indication equipment separately. This approach turns an ambiguous fuel claim into a manageable set of configuration questions without assuming that a familiar-looking gauge, a recent panel upgrade or a general service entry resolves all of them.