Question about 1996 Subaru Impreza

2 Answers

Car starts then stalls after 5 seconds

Replaced fuel pressure valve. Fuel pressure is 28 psi at idle. 40 psi with vacuum hose disconnected. Car starts runs for 6 seconds then goes into a stall. Fuel pressure does not decrease when this happens. If I put vice grips on the return fuel line the fuel pressure goes up to 80 psi and the car runs forever. Very confused.

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  • jjjj Apr 26, 2013

    I just replaced the fuel pressure regulator valve. That was the first line. Sorry I left the word regulator out.

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2 Answers

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  • Expert
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Check the volume of fuel! You may want to change your fuel filter!
When was the last your fuel filter ws changed?

Posted on Mar 19, 2015

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  • Subaru Master
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Sounds like you need to replace your fuel pressure regulator.

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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SOURCE: car running fine. changed fuel filter. now turns over but stalls,

If this had the problem before you worked on it then it could be bad gas. If after the fuel filter change, check the flow direction on the fuel filter and you may want to take off the filter and blow into it to see if it is clogged. Usually the fuel is looping around the system. Try taking off the fuel cap and start the car. It may be an air pocket and with the cap off it may eliminate the air pocket.

Posted on Jun 03, 2009

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2 Answers

How to check fuel pressure 91 geo storm gsi


1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.



the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)



not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)

24024302-wtht4tipiqsxmsfaksxjx4vs-4-1.jpg

now the words directly from the IMPULSE FSM.

Testing
  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

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It missing sputtering blowing out carbon from tailpipe


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Disconnect the electrical connection to relieve the system's pressure. Start the Navigator and let the engine run until it stalls from lack of gasoline. Turn off the ignition, reconnect the pump's electrical connection and disconnect the negative battery cable.
  • Step 2 Detach the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
  • Step 3 Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. The pressure gauge needs to read 45 psi when at wide open throttle. High pressure readings indicate a malfunctioning pressure regulator. Low pressure readings indicate a clogged fuel filtermag-glass_10x10.gif or a broken fuel pump.
  • Step 4 Cut the engine. Relieve system pressure and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs.
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  • Step 6 Inspect the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably a faulty fuel pump.
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    replace the fuel filter first,then check the pressure again.

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