low fuel pressure
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Freshman User
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low fuel pressure
I have a 97 Explorer that sometimes feels like it's running out of gas. I got a check engine light on and one of the reasons the computer said was low fuel pressure. question- what would cause low fuel pressure? is it a weak fuel pump or the fuel regulator? how can you test which one it is? I thought fuel pumps either work properly or they don't work at all. Fuel filter was changed about 5,000 miles ago.
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Joined: Oct 2005
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If the fuel filter is clean you could have an electrical problem - low voltage at the pump, a bad regulator or a worn out pump. Fuel pressure spec is 30-45 psi. Leak down test- Verify fuel pressure remains within (5 psi) of the maximum fuel pressure for 1 minute after the fuel pump is turned off. Remove vacuum line to pressure regulator with engine running and look for fuel in the line indicating a leaky diaphram, removing the vacuum line should raise pressure about 5 psi. You need an inexpensive fuel pressure gauge to test this.
Logistics Pro
Joined: Jun 2009
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From: Cedar Rapids, IA
I can't recall ever seeing a "low fuel pressure" diagnostic code. Do you have the exact code number? Are you sure it wasn't a code for low fuel tank pressure (emissions-related) or possibly a lean air-fuel ratio?
The code should be in the format P0123.
-Rod
The code should be in the format P0123.
-Rod
Postmaster
Joined: Jan 2009
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From: Chesapeake, Va.
I have a 97 Explorer that sometimes feels like it's running out of gas. I got a check engine light on and one of the reasons the computer said was low fuel pressure. question- what would cause low fuel pressure? is it a weak fuel pump or the fuel regulator? how can you test which one it is? I thought fuel pumps either work properly or they don't work at all. Fuel filter was changed about 5,000 miles ago.
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