Can anyone tell me what the fuel pressure should be (40lbs ?) on a 2.5 AT Sub Forester. Any hill I hit the power drops to nothing and the cruise control shuts off (which I understand, it is suppose to) Also does the fuel pump come out in a door beneath passenger side rear seat?

  • Is this just on hills? Can you go WOT on a flat road? Do you have a scan tool that can read live data or a data logging device?
    – Ben
    Jul 6 '17 at 1:24
  • pretty much just on hills. don't know about log device maybe scan tool. find out later today Jul 6 '17 at 10:19

Any engine codes being shown? Any misfire issues?

There are many reasons why a Forester can lose power - MAF sensor, crankshaft position sensors, air leaks, knock sensor, EGR valves, throttle position sensors, etc; what in particular is making you zero in on the fuel pump? I'd suggest looking at the MAF first - it's easier to get to, and if it just needs a cleaning, a $6 can of MAF cleaner is in most budgets. If it needs replacing, it's a few hundred, but junk yards will have them.

The fuel pump is accessed via an oval hole in the floor - the right rear of the luggage compartment, so just behind the passenger side rear seat. Fuel pressure should be 33-40psi, measured just after the fuel filter in the engine compartment.

  • 1
    Removing the mass air flow sensor and cleaning tomorrow. Did not know this could cause the problem. Will get back to you Jul 5 '17 at 22:53
  • Just remember that you don't touch the actual sensor in the housing - just squirt it with the cleaner... if you touch it, you'll probably damage it.
    – PeteCon
    Jul 5 '17 at 23:20
  • @ForesterDave IIRC that year engine doesn't use a MAF.
    – Ben
    Jul 6 '17 at 1:22
  • @Ben is correct! I pulled up the wrong FSM. It uses a MAP sensor - which I'd recommend grabbing from a junk yard.
    – PeteCon
    Jul 6 '17 at 2:48

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