30 lbs OF FUEL PRESURE??? YES NO ??? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 04-02-2008
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30 lbs OF FUEL PRESURE??? YES NO ???

my truck hasnt been running that great for a while and i finaly had them at school check my fuel presure and i have 30 lbs and i put a new filter in the line what else can i do or what do i need to do or w.e you guys think


Thanks
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Old 04-02-2008
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I thought it was supposed to be 45 or 42, 30 seems low.
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Old 04-02-2008
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Key On Engine Off 35 - 45 psi
Key On Engine Running 30 - 40 psi

thats specs from alldata for your truck, your fine, you wont feel the effects of low fuel pressure till you drop below 20-25 ish
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Old 04-02-2008
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then y is my truck studdering and shaking when i try to go faster it studders and bucks and if i push the gas the whole way to the floor it falls on its face
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Old 04-02-2008
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sounds like it could be a mis-fire, or a number of things. have you checked your spark plugs lately? very bad spark plugs will do what you're describing, or could be a bad ignition coil. im not good at diagnosing over the internet. a bad fuel pump wont really shake, it just feels like the truck is running out of gas, and normally wont go over 20-30 mpg no matter how much you press the throttle
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Old 04-02-2008
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ok
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Old 04-02-2008
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For your 94, it should be approximately 30 PSI at idle vacuum, 40 at WOT. Later Rangers with returnless fuel systems (98+?) run at 64 +/-8 PSI, same spec at idle or WOT.
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Old 04-02-2008
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Quote:
Originally Posted by rwenzing View Post
Later Rangers with returnless fuel systems (98+?) run at 64 +/-8 PSI, same spec at idle or WOT.
yep later rangers 98+ run 60+ fuel pressure, freaked me out the first time i hooked up a gauge to a newer returnless ford lol
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Old 04-02-2008
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so im guna change my plugs tommarow night hopefully i go to busy with painting my interior and the motor was to hot so tommarow hope fully new plugs what the gap supost to be
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Old 04-02-2008
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Could be crappy gas. I only go to name brand places like BP or Shell. Run a couple of fill-ups and see if that helps. you may also benefit from a fuel additive. Hopefully, you don't have something clogging your fuel line (can get a little pricey). Good luck.
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Old 04-02-2008
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The fuel pressure sounds fine, but as mentioned earlier be sure to check the plugs and plug wires. I had this same problem last week and when the fuel filter did not solve it I changed my plugs and plug wires and the motor ran just like new.
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Old 04-02-2008
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ok it might be the wires too but thanks alot guys i want a screaming demon coil but just cant aford it.
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Old 04-02-2008
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do you have access to a scanner to pull some codes, or is the check engine light on?? when was the last time you changed the plugs, wires or coil, at 246k, lol, i think it might be time for a complete tune up
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Old 04-02-2008
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well im at 251k now lol what do you mean by complete tune up give me a parts list to get
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Old 04-02-2008
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My complete tune up consists of a new engine.....140k on a 4.0l ...Broke connecting rod and siezed it up..
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Old 04-02-2008
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Quote:
Originally Posted by Downey View Post
well im at 251k now lol what do you mean by complete tune up give me a parts list to get
like if you check the haynes manual, or even the manual that came with the truck, or you could even call up a ford dealer, but they tell you what you should do for like 30K 60K 90K 120K and so forth. but i know, its plugs, wires, coil or cap and rotor if it applies, every filter, belts (timing and accessory belt), i dont know about timing chain, but i know if you have a timing belt they want you to replace it. and i hate to say it, you might even wanna think about getting the head gaskets changed out, unless they have recently been done, like within a 100k or so if you feel like it.

but damn 251k miles, do you have any leaks or cel lights coming on.
just goes to show you how built those old ford engines are

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Originally Posted by ProjectBeastlyRanger View Post
My complete tune up consists of a new engine.....140k on a 4.0l ...Broke connecting rod and siezed it up..
thats one way to do it
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Old 04-03-2008
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the guy i bought the truck from had kept a log of all that stuff im guna have to get that little book out and read it thats the thing that sold the truck with that many miles
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