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Jul 5, 2013, 8:47 AM

Post #1 of 4 (1146 views)
fuel pressure Sign In

I have a 94 mazda protege need to do fuel pressure test. What should fuel pressure read at?

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 5, 2013, 9:07 AM

Post #2 of 4 (1126 views)
Re: fuel pressure Sign In

If this engine should be this..............
FUEL SYSTEM PRESSURE 1994 Mazda Protege 1.8L MFI SOHC 4cyl The Fuel System Pressure

64-92 PSI (Pounds per Square Inch)Start the engine and then proceed to disconnect theelectric fuel pump connector. Allow the engine to idleuntil it runs out of fuel and stalls. Turn off theignition switch, disconnect the negative battery cableand attach a fuel pressure gauge to the fuel pump,then plug the other end of the fuel hose.Reconnect the negative battery cable, then attach anan electrical jumper wire between the fuel pump andnegative pin terminals of the data link connector.Verify that no leaks are present, and with theignition key in the on position, energize the fuelpump and bring the system to a stabilized fuelpressure. Visually verify the PSI reading on thegauge.
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(This post was edited by Tom Greenleaf on Jul 5, 2013, 9:07 AM)

Hammer Time
Ultimate Carjunky / Moderator
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Jul 5, 2013, 10:24 AM

Post #3 of 4 (1112 views)
Re: fuel pressure Sign In

Here are the correct regulated specs

Fuel Pressure Specifications

Regulator vacuum hose connected
Fuel Pressure 206 - 255 kPa (30 - 37 psi)
Regulator vacuum hose disconnected
Fuel Pressure 265 - 314 kPa (38 - 46 psi)


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 5, 2013, 1:21 PM

Post #4 of 4 (1100 views)
Re: fuel pressure Sign In

That makes a lot more sense than what data I found which was just maxing out the thing I think by force??


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