The fuel injector tester kit is designed to identify and diagnose malfunctions in fuel supply & injection systems and help find possible causes. Suitable for most fuel injection systems in gasoline vehicles such as cars, trucks and ATVs. Incompatible with Bosch, CIS-Jetronic, or GM throttle body systems because of no suitable connection adapters. Also not fit diesel high pressure injection pump or high pressure fuel track on direct-injection engine due to the test range: 0-140psi /0-10 bar Gas fuel pressure tester gauge kit equips with various fittings and hoses for test, and supports two assembly forms. One is to connect pressure gauge directly to fuel pump's standard Schrader / M6 / M8 / M10 / M12 / M14 fuel pressure test port with 15" / 8" hose and M8 / M10 / M12 / M14 adapters. The other is to measure by fitting the T-type joint between the fuel pump and engine. Please note: no small Schrader connector in this fuel presure test kit to perform service for some Ford models. Accurate fuel pressure gauge has a 3-1/2" big color-coded dial with shockproof rubber cover. 15"L hose can attach to the 1/4" SAE standard Schrader valve on fuel pump or fuel rail directly. The built-in translucent fuel discharge hose and pressure release valve work for safe pressure release & easy fuel recovery. The connectors are made of brass and aluminium, good airtightness & anti-corrosion. Reinforced rubber resin nylon hoses (WP:300PSI) are resistant to torsion & high temperature After testing the fuel pressure by YSTOOL gasoline engine fuel injection pressure tester, compare the reading with the recommended pressure range. If higher, it could be a faulty fuel pressure regulator or a bent clogged return line. If lower, possible causes are dirty fuel filter, weak pump function, incorrect fuel tank exhaust, restricted fuel line, clogged pump inlet filter or electrical control failure. Petrol is highly flammable, please ask professionals to operate with no open fire nearby Package List
1x 3-1/2" big dial pressure gauge
1x 14"L long hose with 1/4" Female brass parts
1x 8"L short hose with 1/4" Male x M6 brass parts
1x T type parts (Aluminium tee parts 1/4" & 3/8" barbed x 1/8"-24NPT & brass parts 1/8"-27NPT x 1/4"-18NPT)
13x Brass parts
1x Hose (1/4" x 3-1/2"L)
1x Hose (3/8" x 3-1/2"L)
2x Hose clamps
1x Instruction
1x Blue case

2 Types Connection Methods
1. Use 14" hose / 8" hose and M8 / M10 / M12 / M14 adapters to connect pressure gauge directly to fuel pump's standard Schrader / M6 / M8 / M10 / M12 / M14 fuel pressure test port
2. Use T type parts insert in-line between the fuel pump and engine for most other vehicles

Test Result
Kink/leak/clog on inlet side components
Kink/leak/clog on outlet side components
A detective fuel pump or fuel pressure regulator
Low tank pressure