fuel pump pressure ? ? ?

[ronchy1962]

I have a 1998 explorer 4.0 sohc. I am having fuel pump concerns. Because this is a sohc engine,I have read,in different places that the pump pressure is 64-75psi and in other places 30-45psi. Can anyone tell me the correct psi. rating? I checked the fuel pump pressure key-on 36psi,running 33psi.,key-off 28psi. My problem, is sometime the engine will start on the first try and other times it take several key on-off cycles before it will start. Sometimes it coughs, sputters,chokes then dies.
I sure hope someone can help me,before I install a new fuel pump, in hopes this is the solution. Someone suggested the cps. I am afraid to let my wife drive for fear of her getting stuck.
Thanks for the replies.

 

[2000StreetRod]

Ford Explorer Ranger Fuel pressure test procedure

Ford Explorer Ranger Fuel pressure test procedure

 

[ronchy1962]

Is it correct in saying a 1998 explorer 4.0 sohc fuel pump pressure is 30-45psi and a
1999 explorer 4.0 sohc fuel pump pressure is 60-75 psi
My pump pressure is 36.5 key on,33 running,28 key off.
I left the pressure gauge attached.After 24hrs, the gauge reads 15psi. Turned key on,gauge went to 36.5,engine on 33psi, 3000rpm 31psi,engine off key off 28psi.
Does this sound like a fuel pressure problem,or maybe a cps,or maybe a PATS.
I was about to change the fuel pump,but now I am not too sure. Somebody,PLEASE HELP

 

[2000StreetRod]

perform the procedure

If you perform the procedure I provided a link for you can answer your question yourself.

 

[Runnin'OnEmpty]

....... My problem, is sometime the engine will start on the first try and other times it take several key on-off cycles before it will start. Sometimes it coughs, sputters,chokes then dies.
.........Someone suggested the cps.......

I doubt if it's the CPS; that would trigger a code and
MIL.

The symptoms you describe can very well be from a
bad fuel pump. I just went through this on an 04
Ranger; same symptoms. First things to check of
course, are the fuel pump relay and the inertia switch.

On my Ranger, the pressure checked good, as did the
leak-down. The problem was in the initial turn-on of
the pump. I plan on taking the old pump apart and
trying to see why these pumps fail prematurely. Mine
had only 61K miles on it....

 

[ronchy1962]

Thanks

Thanks so much for the reply. The pressure is just within specs. I am going to replace the fuel pump assembly. I found a link on accessing the pump by cutting an access hole in the floor,don't have to drain the tank.
I was going to purchase a FORD replacement. But, due to the warranty, I found a replacement,considerably cheaper and with a lifetime warranty. And with the access hole, R&R should be easy,if it comes to replacing the replacement. LOL