What is the correct fuel pressure at the rail for a 2004 Lincoln Aviator?

The P1237 means Fuel Pump Secondary Circuit Malfunction.
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autel maxidas ds708

Just so you know, I asked about the fuel pressure sensor,
at a local Lincoln Dealer, about a year ago

They only sold 3 in a five year period, for all vehicles,not likely bad

Put a gauge on the fuel rail port or use a scan tool
to look at data

It has to be in the end of the fuel rail somewhere, but you
may also have a fuel temp sensor,my lincoln ls does

What are the issues?,

check tire pressure in all tires & spare.

25-65 psi

It can only be a small area. Does it seem to be coming from the fuel rail area, which is usually chrome color. The fuel pressure regulator or fuel line. The fuel line come up the driver side firewall connects to a regulator, and then feeds into the fuel rail. Any of these connections could be the leaking source. Also one of the rubber o rings for the injector could be leaking. Look to see where it mostly looks to be coming from and feel around the pipes for the gas.

fuel rail connector or return connector

fuel filter or bad coil pack

sucking air from intake manifold or other vaccum leaks ..possibly check brake booster vac line ..just some possibilities

its behind a cover above the catalytic converter, on the right hand side of the truck. This can be a fuel spill hazard and possibly get into your eyes . You may want to re-consider.

I just changed the fuel filter on my 2003 Aviator and it was a pain. Aftwer looking and looking I finally found it. It is located under the truck at the center of the front crossmember behind a shield. Two bolts hold the shield and there are two quick release hoses on the fuel filter itsself. Good luck!!!