Question about 1994 Subaru Justy

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91subaru justy new fuel pump in it and only way will run if clamp off return fuel line then running too rich what could be prob and what should fuel pressure be

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  • Mark Stuart
    Mark Stuart May 11, 2010

    Is it fuel injected? If so, I would suspect the fuel pressure regulator may have failed. I don't know what the fuel pressure should be on that model, sorry.

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  • 35 Answers

Have you tried relieveing the fuel pressure thanks jeff

Posted on Nov 30, 2008

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My fuel pressure goes to 60 pounds when the keys is turned on then starts dropping Is it my fuel pump or pressure regulator? 2004 GMC Yukon XL


Fuel pressure may drop due to a leaking injector or bad check valve in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to the tank as well. Prime the fuel line and pinch off the return line ( if possible ) to eliminate a regulator problem. If the fuel pressure drops with the return line pinched off, suspect a leaking injector or fuel pump. If injector is leaking, the vehicle should run rich and cause a hard start/rough run condition

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2000 Ford E150 4.2 obd2 codes 1132 an 1152


Disconnect the fuel return line at the fuel rail and monitor your fuel pressure when the ignition switch is cycled to the run position several times WITHOUT starting the engine. Connect a hose to the rail to allow fuel to drain and not spray all over the back of the engine. If your fuel pressure is high (60psi or higher) it will show that you have a defective fuel pressure regulator , or debris in the fuel rail causing a blockage of fuel flow. If the pressure is normal with the return line disconnected it suggests the fuel return line is plugged up between the engine and tank or in the tank. Your issue is that you are Running extremely rich, hence your O2 reading .

Sep 05, 2014 | Cars & Trucks

1 Answer

Engine running rich


The only thing I could think of to make it run rich is if the pump is wrong for the car, or something happened to the return line to the tank. The pressure regulator should maintain pressure, and the injectors should be functioning as before you changed the pump.
Is the check engine light on, and is the fuel pressure normal ?

May 22, 2013 | Cars & Trucks

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New fuel pump new regulater .fuel pump runs but will not prime up and shut off


sounds like you hooked the hoses up wrong at the pump unit or you have a bad fuel filter...replace the filter first..then check those hoses and clamps.

Feb 07, 2011 | 1995 Ford Explorer

2 Answers

Car lazy to start


Hey bro, your diesel pump might be on the way out but here are some things to check and do and see if they help.

Replace the hoses going from the pump to the diesel filter with new ones.

Use fuel injector type clamps, NOT gear clamps they don't tighten enough to stop air not getting in.

Change the diesel filter, and make sure the drain on the bottom of it, if it has one which most do, is nice and tight.

Air bubbles in the injection lines are usually a sign of a weakening injection pump but I ran mine like that for a long time, the air works it's way through. Are you leaking any diesel? Maybe check the returns to the tank. Cheers bro.


Mar 29, 2010 | 1995 Volkswagen Golf

1 Answer

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try adjusting the distributor

Jun 08, 2009 | 1987 Subaru Justy

1 Answer

How many fuel lines does a 1988 subaru justy have?


2 fuel lines you got a fuel supply line and a fuel return line.

Apr 04, 2009 | 1988 Subaru Justy

1 Answer

91 subaru justy wont run unless clanp on return fuel line


measure fuel pressure with engine idling the fuel gauge should read 20-24 psi if not within specification replace the fuel pressure regulator.

Oct 26, 2008 | 1994 Subaru Justy

1 Answer

Location of fuel line and fuel pump on a 1988 Subaru Justy


I imagine you have found it by now but just in case, the fuel pump and filter are mounted on the underside of the frame just ahead of the left rear suspension.

May 30, 2008 | 1988 Subaru Justy

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