2000 explorer XLT, 4.0L, OHV (VIN "X")---sitting for 15 months, engine turns over but no start unless 10 cc's of gasoline into intake manifold, then runs for 4-5 seconds. Fuel pressure of 5-6 PSI at fuel rail AFTER replaced fuel pump assembly and fuel filter. I can hear fuel pump come on for about a second with key on. Doubel checked fuses and relays for fuel pump and PCM, then again checked that engine would run briefly with gas squirted into intake manifold. Advice for next step??
Questions: 1) Could fuel lines be clogged after sitting for over a year?
2) Area driver's side next to spare tire, underneath jack storage, where return fuel lines are clustered (nuts are rusted and need to be sawed off)---some type of fuel regulator here? I thought fuel pressure regulator was on fuel pump assembly.
thanks for any help or advice.

 

Fuel pump is working as designed, runs 2-3 sec at key on to prime, then shuts off.

Fuel pressure must be >32psi at rail, your Fuel pressure regulator is stuck open...

On X engine it should be on fuel rail.

 

thanks for advice. Intake manifold is coming off the next day I have off work.

 

Why is the intake manifold coming off, has no bearing on fuel pressure.

 

for access to fuel rail to replace fuel pressure regulator

 

On my 1994 explorer XLT, 4.0L, OHV pushrod engine the fuel pressure regulator is near the fuel pressure schrader valve which is on the right hand fuel rail. Both are exposed to the outside world, not under the intake manifold.

 

on my 97 "X", the FPR is next to the pressure test port, front of rail....

 

isn't that the fuel injector pulse dampener? Not sure how the FPR could be on the upstream side of the fuel rail?

 

Basic hydraulics, the pressure in the manifold can be as much as 65psi @ high speed/rpm, regulated by spring and engine vacuum.

Having said that, the fact is it will never start at 5-6psi on the rail.
But you can have it your way,

 

from an online source:

Pulse Damper

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Pulse Damper

<INPUT class=zoom_btn onmouseover="this.className='zoom_btn_ovr';this.st yle.cursor='hand';" title=Zoom onmouseout="this.className='zoom_btn_rdy';" onclick="javascript:zoomImage('/alldata/AFI~V22889562~C34322~R0~OB0~P2R0H~N/0/77993956/80829349/80829379/80829385/34853741/34857029/34858641/56208458/14621125/83221676/83221677', 1, 650, 527, 'zoomWindow', 'Pulse Damper', 'NONE', HIGHNONE);" type=button> ******** language=JavaScript> <!--var HIGHNONE = "";// --> *********> <INPUT style="CURSOR: hand" class=sized_for_print_btn_rdy onmouseover="this.className='sized_for_print_btn_o vr';this.style.cursor='hand';" title="Sized for Print" onmouseout="this.className='sized_for_print_btn_rd y';" onclick="javascriptrintImage('/alldata/AFI~V22889562~C34322~R0~OB0~P2R0X~N/0/77993956/80829349/80829379/80829385/34853741/34857029/34858641/56208458/14621125/83221676/83221677', 650, 527, 'printWindow', 'Pulse Damper', 'NONE', HIGHNONE);" type=button>

The fuel rail pulse damper located on the fuel rail reduces fuel system noise caused by the pulsing of the fuel injectors. The vacuum port located on the damper is connected to manifold vacuum to avoid fuel spillage in the event the pulse damper diaphragm were to rupture. (The pulse damper should not be confused with a fuel pressure regulator, it does not regulate fuel rail pressure.

Regardless of your misconception of hydraulic pressure regulation, this part on 4.0 L OHV engine is not the fuel regulator.

 

Please go back and reread my submission, never did I purport or presume, that the Pulse dampener is part of or replacement for the Fuel Pressure Regulator.

I was responding to the question of how the pressure upstream of the FPR works.

In fact if you read my post you will see that I instructed the poster to look for the FPR on the rail.... I certainly do not have any misconception of hydraulic pressure regulation.. and have 35yrs of engineering background to support.

 

is having a problem with mine almost the same change fuel pimp and fuel regualtor and also the tps i have only 12 pounds of fuel pressure and mine will barely run is running out of things to try