In this month’s tool test, we’re checking out the Fuel Zapp fuel system analyzer from Thompson Automotive Labs. This multi-featured tester is used to measure both fuel system pressure and fuel volume. It is also fitted with an exhaust pressure gauge and a conventional engine vacuum gauge.

What’s In the Box?

Fuel Zapp Kit Contents:

1-4 - Fuel Zapp Test Console

1) Fuel Pressure Gauge
2) Engine Vacuumn Gauge
3) Exhaust Pressure Gauge
4) Fuel Volume Gauge
5) Pinch Pliers
6) Hose Adapters
7) Owner’s Manual
8) CD with Tool Box Calculators


The fuel pressure gauge is calibrated in both psi (0-100) and bar (0-7). Use it as you would any other fuel system pressure gauge.



The manifold vacuum gauge is calibrated in both inches of mercury (0 to 30) and kPa (0 to 100).



The exhaust pressure gauge is calibrated in psi (0-15) and kPa (0-100). Use the special adapter included in the kit to to sample exhaust backpressure.



Screw this adapter into the exhaust in place of an oxygen sensor to sample exhaust backpressure. Any readings greater than 1 psi at idle or 3 psi at 2500 rpm, suggest a clogged exhaust.



The kit includes hose adapters to fit most common fuel line quick connects, as well as three “universal” hose diameters for systems with clamp-on hose connections.



All adapters are fitted with quick disconnect couplers for quick installation on the main Fuel Zapp test hoses.



Screw-in and banjo fitting adapters are also included for vehicles that require them.



Use these plastic locking pinch pliers to create a calibrated restriction for some flow tests, and for sealing off fuel lines when testing system rest pressures.




Vacuum gauge and exhaust pressure gauges have barbed nipples for a secure sample hose fit.