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Case Study: Fuel Tank Cap Supply for a bus operator in the Middle East

Source:Case / Time:2026-09-18

Fuel Tank Cap for A bus operator in the Middle East

A bus operator came to us with a fuel tank cap programme for the Middle East. The brief was ordinary and unforgiving at the same time: a fixed launch window, a landed cost that had to survive freight and duty, and a part that had to match an existing sample. This case records what was specified, what went wrong in sampling and how the bulk order landed.

The starting point

  • A specification nobody had written down
  • A fitment that looked right on paper and failed on the bench
  • Inconsistent hardness between lots

Fuel Tank Cap case study

What was specified

PartFuel Tank Cap
ClientA bus operator
Marketthe Middle East
Volume2,000 pieces across 6 specifications
Base materialCarbon Steel
Sampling rounds2
Delivery window5 weeks from PO to ex-factory
ComplianceSAE J431

How it was resolved

  1. The specification was rebuilt around Carbon Steel and the tolerance locked before bulk.
  2. A pre-production sample was approved and kept as the golden reference.
  3. Production ran with in-line inspection and a mid-run photo report.
  4. Cartons were packed to the client's own barcode and ratio specification.
  5. Documentation shipped with the goods instead of after them.

Fuel Tank Cap production run

Result

  • 2,000 pieces delivered inside the 5-week window.
  • Unit cost held within 2.0% of the original quotation.
  • Inspection-related rejection stayed under 0.5%.
  • The specification is on file, so reorders reproduce the approved sample.

What we would repeat

Fix the specification count early. Adding variants after production starts is the most expensive change a client can request.

Planning something similar?

Share a sample or a drawing and we will quote against a written specification, not against a photograph.

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