ASE F1 Compressed Natural Gas Vehicles case studies
ASE F1 Compressed Natural Gas Vehicles · Put your knowledge to work in context.
The ASE F1 credential is a specialty certification for technicians who service and repair compressed natural gas vehicles. It is aimed at working technicians in fleet shops, transit agencies, refuse and delivery operations, and independent garages that maintain CNG buses, trucks, vans, and light-duty conversions. The ASE F1 Compressed Natural Gas Vehicles case studies are 5 cases and about 2,716 words.
1Cold-Start Rough Idle After Cylinder Replacement
A 2011 dedicated CNG van (OEM bi-fuel-converted, now dedicated) comes in with a complaint of rough idle and occasional stall for the first 30 seconds after a cold start, then runs normally. The customer recently had one of the roof-mounted Type 4 cylinders replaced at another shop.
591 words, about 3 min2High-Pressure Line Fitting Leak After Collision Repair
A CNG pickup was in a front-end collision and the body shop replaced the front bumper, radiator support, and a section of the high-pressure stainless line that runs along the frame rail. The line was cut and a compression-style flare fitting was used to join the new section to the original line.
515 words, about 3 min3Lean Bank at Altitude With Normal Trims at Sea Level
A dedicated CNG shuttle bus operates at sea level and makes a daily run to a mountain facility at 7,500 ft. At sea level, fuel trims are within ±3% and the bus runs well.
565 words, about 3 min4Hard Start and Backfire on a Converted Bi-Fuel Truck
A 2008 pickup was converted to bi-fuel (gasoline/CNG) with an aftermarket kit. On gasoline it starts and runs normally.
504 words, about 3 min5Slow Fill and Overheating Cylinder During Fast Fill
A fleet operator reports that a CNG van takes much longer than normal to fill at a public fast-fill station, and the station attendant notes the cylinder gets warm during fill. The van has a single Type 3 cylinder with an integral manual valve and a fill receptacle behind the fuel door .
541 words, about 3 min