There are times when working on cars, that you want a specific relay to turn on, in order to test the operation of the device that's being controlled by the relay. That is when these fuel pump relay bypass modules are so handy! The kit comes with six different sizes, to hopefully have one that matches the relay in your vehicle that you want to test. Pull out the relay and then insert one of these testers into the slot. Each device has a rocker switch on it, letting you simulate that the relay is either on or off, so you can test the device connected to the output. Although they are marketed as a fuel pump tester, they work great to test electric fans and even vehicle lighting. I like all of the different sizes that it includes.

These tools have already proved useful while diagnosing a generator of mine. I was able to quickly and easily force the fuel pump on and found my problem! They appear to be made well, and while I haven't used them much, I expect them to bu another useful tool in my diagnostic toolbox!

I received six assorted relay-testers in a cardboard box. the relays aren't labelled, but its easy enough to examine the removed relay and select the appropriate tester. once the tester is installed, the switch on the top controls the circuit under test, making it easier to troubleshoot various problems.in my case i was trying to track down a fuel pressure problem. before i got the testers i would have used key to turn on and off the fuel pump, and without the car running the pump wouldn't run continuously. with the tester installed in place of the fuel pump relay, i have direct control of the pump and can turn it on and off at will, from under the hood. I no longer need a helper to turn on and off the ignition switch from the driver's seat.very useful product!

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Useful testing kit. If it had an integrated LED light it would have been perfect! Competitively priced at $16 for the set.

The ISINFLASH Fuel Pump Relay Bypass Master Kit is a versatile diagnostic tool designed to simplify troubleshooting and testing of fuel pump relays. It includes a set of relay bypass switches that can be used to test fuel pump circuits without requiring a direct replacement. Here’s a detailed review of its features and performance:Pros:Comprehensive Diagnostic Tool: This kit is a great option for automotive enthusiasts and mechanics who need a quick and efficient way to diagnose or test fuel pump relay systems. It helps you bypass the relay to test the fuel pump, saving time and effort during troubleshooting.Pack of 6: The kit includes six relay bypass switches, providing multiple tools for different vehicles or jobs. This is particularly useful if you're working on multiple cars or want backup options in case one of the relays wears out or becomes damaged.Easy to Use: The relay bypass switch is designed to be simple and user-friendly. Mechanics or DIYers can easily connect it to the existing relay socket, allowing for quick testing of the fuel pump without needing to remove or replace the relay itself.Replaces Multiple Part Numbers: This kit is compatible with part numbers 9036, 9037, and 9038, making it a direct replacement for several common relay types. This compatibility ensures that it works with a wide range of vehicles, offering flexibility across different makes and models.Durable Build: The components in the ISINFLASH kit are generally well-built and designed to handle the demands of automotive testing. The solid construction ensures that the bypass switches can withstand the wear and tear associated with frequent use, providing reliable service over time.Cost-Effective: Compared to purchasing individual fuel pump relay bypass tools, this kit offers a cost-effective solution by including six switches at a reasonable price. This makes it a valuable investment for mechanics or hobbyists working on different vehicles.Cons:Not for Complex Diagnostic Needs: While the ISINFLASH kit is great for basic fuel pump relay testing, it may not be the best tool for more advanced diagnostics. For example, if you need to test other electrical components or need a more in-depth scan, you might need a more sophisticated diagnostic tool.Limited to Specific Relay Types: The kit is compatible with certain relay part numbers (9036, 9037, 9038). If your vehicle uses a different type of relay, this kit may not be suitable for your needs. It’s important to ensure that the relays in your vehicle match the part numbers before purchasing.Bulkier than Individual Relays: Since this kit includes six bypass switches, it can be bulkier to store compared to buying individual relays. For users who only need one or two, it may seem a bit excessive, though the extra tools provide value for multiple vehicles or larger repair shops.Plastic Housing: Some users have noted that the housing of the bypass switches could be made of more durable material, as it is plastic. While generally durable, there is a chance that the plastic might crack or wear down if subjected to rough handling or prolonged use.Overall Verdict:The ISINFLASH Fuel Pump Relay Bypass Master Kit is an excellent tool for anyone who needs a quick, reliable method to test fuel pump relays. It’s ideal for automotive diagnostics, offering six relay bypass switches that are easy to use and compatible with several common relay part numbers (9036, 9037, and 9038). The kit is durable, cost-effective, and makes troubleshooting fuel pump systems much more convenient.However, it’s best suited for basic testing and might not be the ideal solution for more complex diagnostic tasks. If you’re working with vehicles that use different relays or need more advanced tools, you might need to consider additional diagnostic equipment. Overall, this kit is a valuable and practical option for mechanics or DIYers who need a simple, effective way to test fuel pump relays.