1994 Honda Prelude VTECFACTORY OEM SERVICE PROCEDURE

Pressure Testing

  1. Disconnect negative battery cable. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Connect Fuel Pressure Gauge (07406-0040001 ) at 6-mm bolt. Reconnect negative battery cable. Start engine, and note fuel pressure. If vehicle will not start, check for spark. If spark is present and no fuel pressure is evident, inspect fuel pump main relay.
  2. Remove connector from fuel pump main relay. See Fig 1 . Using a test light, check power on Black/Yellow wire at fuel pump relay connector. If power is present, go to next step. If power does not exist, repair open wire between fuel pump main relay connector and fuse No. 2 on fuse box. Go to step 4).
    Fig 1: Locating Fuel Injection Main Relay
    G92B26659Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Connect jumper wire between Black/Yellow wire (B+) and Yellow wire. If fuel pump runs, go to next step. If fuel pump fails to run, see SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE Section.
  4. Start engine. Disconnect vacuum hose from pressure regulator, and check for manifold vacuum. If vacuum is not present, check for restriction in vacuum port or hose. Plug vacuum hose and inspect fuel pressure gauge reading. Gauge reading should be within specification. See REGULATED FUEL PRESSURE  table. Pressure should drop slightly when vacuum hose is reconnected.
REGULATED FUEL PRESSURE

Application At Idle psi (kg/cm2 )
Prelude (1)
2.2L Engine (F22A1)
Vacuum Hose Disconnected 36-43 (2.5-3.0)
Vacuum Hose Connected 28-35 (2.0-2.5)
2.2L Engine (H22A1)
Vacuum Hose Disconnected 33-40 (2.3-2.8)
Vacuum Hose Connected 25-32 (1.8-2.3)
2.3L Engine (H23A1)
Vacuum Hose Disconnected 36-43 (2.5-3.0)
Vacuum Hose Connected 28-35 (2.0-2.5)
(1) Measure regulated fuel pressure with vacuum hose connected and disconnected from pressure regulator.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.