Step 2: Submerge swab into fuel tank until it touches lowest point at bottom of tank. Brush tank bottom several times with swab.
Step 3: Remove swab; let dry 2-3 minutes (do not exceed 3 minutes).
Step 4: Compare to diesel fuel & tank test charts.
Product Description: Diesel Mechanic In A Bottle 4-In-1 Test Swabs are a diagnostic tool to test diesel fuel to determine if it is fresh, marginal, or bad.The test swabs test for bad fuel (oxidation), watercontamination, rust / scale, and sludge / asphaltenes. Use Diesel Tank Snakes to eliminate theseissues. Usage Instructions: Store sealed test kit in a cool, dry place out of direct sunlight. Shelf life is 1 year from firstopening.