90 2.9 LOW fuel pressure problems!!!! AHHHH!!!!!

[Killtime8]

I have a 1990 ford ranger with the 2.9 v6 engine.... Having fuel issues.

KOEO fuel pressure starts at 10 psi and will NOT build pressure, if I cycle key on and off and back on it will raise barely 1 psi each time.

As soon as I start the truck, several cranks, fuel pressure will drop back to around 10 from whatever I finally built it up too..... and it will go up a few psi and drop dramatically.

It will idle seemingly properly but I have to flutter the gas to get it to rev up at all, or BARELY push down the gas to slowly raise the rpms. If I floor the gas it will "bog" down and start to hesitate, sputter, pop, backfire from the intake it seems, and the rpms will start to drop. When I push the needle in at the fuel rail pressure check fuel comes out but with almost no pressure and it seems to be aerated. I have put a new: Fuel filter (2nd new one), fuel pressure regulator and the fuel pump is 4 months old bought brand new from orielys (however its spelt) for 140$...... When I turn the key over the fuel pump is working because: I can hear it and I have the bed off now so I have pulled the lines right on top of fuel tank and watched it spew fuel out. I have busted the incoming fuel line loose at the rail, laid it over the fender, and watched it spit fuel out. So I know I have fuel at the rail.... I have no vacuum leaks as far as I have found, Map sensor is used but should be good and if NOT I have 3 laying around and all of them don't improve the condition ( I have tried putting all 3 on the truck ).

I'm just done messing with this truck, I'm at the end of the line with this thing. Would like some help PLEAAAAAAAAAAAAAAAAASE before I wrap her around a tree.

Thanks alot for looking and help guys, I really mean it

 

[easyeric]

hey, i have an 89 with a 2.9 had th same issues like a year ago, fuel pump, had to take my autozone ...go to th same symptoms rebuilt pump back like 4 times would start out okay than go bad quickly.try th warrenty on that pump. shouldn't have to pay for it again.

 

[Killtime8]

Yeah I know, Somehow I have every receipt BUT that one

So your saying it was your fuel pump? I'm sorry I don't understand. Like I said mine still "works" it is moving fuel ....

thanks for a reply

 

[RustedRanger]

Just because it "moves" fuel don't mean it's good,it has to have enough pressure. Next time you buy parts try ebay or rockauto.com and save an arm and a leg...you have the internet so shop around there first. When it comes to fuel pumps get a good brand like Carter...the no names fail quicker.

 

[BRUTUS_T_HOG]

if you are getting a full 12volts to the fuel pump and you have good ground at the pump then you need a fuel pump.

if you are not getting full battery voltage to the fuel pump look at the fuel relay for burnt terminals.

 

[easyeric]

saying that can run with low pressure, and be a pain to diagnose. i promise dude th fuel pump may run, but not have optimum pressure.

 

[tsimmons21]

..

check the fuel pressure regulator. thats what builds pressure, if you think you have a good pump.

 

[cmr2]

Is there two pumps / sending unit // one on the frame rail / one in the tank , is the hoses in the tank cracked/ broke

 

[Killtime8]

New fuel regulator

I just put a brand new Fuel Pressure Regulator on and like I said the fuel pump was brand new 6 months ago. I would have already taken the pump back, which is still under warranty, BUT the receipt got up and walked away like usual. I'm trying to get a friend of mine that use to work at Oreilys to get a day off so he can go up there with me and try to "work something out". I REALLY don't feel like buying another pump for this thing...I've put WAYYYYY to much money into it as it is (daily $$$ driver). I hope it is the pump though because there really isnt much else it could be... Thanks for the replies guys.

 

[Killtime8]

Turns out it was the fuel pump.....

Well I went ahead and paid the 120$ for another fuel pump anddddddddddddddddd it was indeed the other pump had just gotten weak. I'm not sure how that happened in just a 6-8 month period but its whatever I guess. Thanks guys for all the replies, this forum rocks!