But, because a speed density system provides an indirect measurement of air flowing into the engine, it lacks the accuracy to meet modern emissions and performance standards.Īt the same time, European engineers achieved a more precise measurement of intake air flow by using electro-mechanical air flow sensor that incorporates a spring-loaded pivoting air vane to measure air flow. During the early 1980s, engine computer management systems relied upon a speed density fuel system that used inputs from a throttle position, engine speed, intake air temperature, and manifold absolute pressure (MAP) sensor to estimate the grams per second of air flowing into the engine.ĭue to the MAP sensor, the speed density system can compensate for variations in weather and altitude. Armed with this knowledge, it’s entirely possible that you can provide an alternative solution to your customer’s problem.Īutomotive engineers know that 14.7 grams of air must be mixed with 1 gram of fuel to achieve nearly perfect combustion in a modern engine equipped with a catalytic converter. If you understand that a defective mass air flow (MAF) sensor can cause an extremely lean condition by underestimating the amount of air flowing into the engine, then you can understand how a defective MAF sensor can be mistaken for a defective fuel pump assembly.
This extends to all products and/or services sold or otherwise imparted by JET without regard to the involvement of JET in the design, manufacture, sale, and/or use of any JET product or service.Let’s say that an amateur mechanic believes the P0171 “system too lean, bank one” trouble code that he retrieved with his code reader indicates that the fuel pump you sold him a month ago is defective. Upon purchase, purchaser expressly waives any and all liability on the part of its agents, employees, and representatives arising out of any product failure. Purchaser assumes all risk and liability whatsoever from any use or misuse of JET products. This warranty does not apply to products incorrectly installed, modified, or to any product which has been subject to misuse, negligence, or accident.įurthermore, any product used in any kind of competition is specifically excluded. Costs for labor are specifically excluded and are the sole responsibility of the purchaser. Repair, replacement, credit or refund (at the sole discretion of JET) will be granted on any warranty claim approved in writing by JET. All other products and services are fully warranted in defects in material and workmanship for a period of six months from date of purchase. All JET Performance Products electronic components carry a TWO-year warranty to the original purchaser.
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