Fuel Injector for GMC Sierra: Cast Iron
This fuel injector for the GMC Sierra is specified around cast iron, which decides how it behaves in service far more than the part name does. We build to a written specification — base material, dimensions, finish and packing — and hold that specification on file so every reorder reproduces the approved piece.
The usual reason a programme changes supplier is not unit price. It is premature wear on the first batch, or a specification nobody had written down. Both are specification problems, and both are preventable.

Specification
| Product | Fuel Injector |
|---|---|
| Vehicle application | GMC Sierra |
| Material / finish | Cast Iron |
| Typical use | Roadside Assistance |
| MOQ | 3,000 pieces per specification |
| Sampling | 14 working days, 3 days per revision |
| Bulk lead time | 15-30 days after approval |
| Compliance | SAE J431 |
| Packing | 50 pieces per inner box, 200 per carton |
Material options
- Zinc Plated Steel — chosen where wear resistance comes first
- ABS Plastic — used when the finish has to hold a coating
- Semi-Metallic Compound — used when the finish has to hold a coating
- Kevlar Composite — specified where the part sits close to a heat source
- PVC Coated Fabric — chosen where wear resistance comes first

Processes available
- robot welding
- rubber vulcanisation
- surface grinding
- assembly line testing
- powder coating
- sintering
Fitment notes
Keep the old part until the new one is on the bench. Comparing them side by side settles questions a photograph never will.
Where it is used
The specification above is the one most often ordered for roadside assistance. Related applications include coastal delivery, night riding, construction sites, weekend riding, farm use.
Quality and packing
- In-line inspection with AQL 4.0 sampling on every lot.
- Dimensional report issued against the approved drawing.
- Carton marking and barcode to your specification.
- Golden sample retained at the factory as the reorder reference.
Questions buyers ask
How long does sampling take?
Samples leave the factory in 14 working days, and each revision round adds about 3 days once you have seen the first piece.
What happens if a lot fails inspection?
The lot is re-inspected against the golden sample, and replacement pieces ship on the next available booking at our cost.
How is packing specified?
Individual packing, inner box quantity and carton marking are confirmed at quotation stage so the cartons arrive ready for your warehouse.
Can you match an existing sample?
Send a sample and we will reverse-engineer the specification, then produce a counter sample for approval before any bulk starts.
Send the part number, the annual volume and the target market, and we will come back with a specification and a sampling plan.







