Really Need Help

[BRONCO JIM]

I THOUGHT I KNEW FORDS IN AND OUT,BUT THIS HAS ME STUMPED. I HAVE AN 89 FS,351W,AND THE FUEL PUMP IS HUMMING,LOUDLY.THE HUMM GOES UP AND DOWN WITH THE IDLE AND THE TRUCK IS REALLY EATING GAS. I CHANGED THE PLUGS AND THEY WERE BAD SOOTY BLACK. ALL SENSORS WERE REPLACED,ALONG WITH THE IDLE CONTROL VALVE,AND NEW EEC AND FUEL RELAYS WERE PUT IN.CLEANED ALL ELECTRICAL CONNECTIONS,AND VACCUME IS OR SEEMS TO BE WORKING WITH NO LEAKS.NOW THAT I VE DONE THIS MY CHECK ENGINE LIGHT COMES ON ONCE IN A WHILE,WHEN THE PUMP STARTS HUMMING. SOMETIMES THERE IS NO HUMM,NO LIGHT,AND THE TRUCK RUNS SUPER,BAD FUEL CONTROL PRESSURE VALVE ?,BAD FILTER,CLOGGED FUEL RETURN TO TANK ? I M THINKING THIS MAY BE A OVER PRESSURE PROBLEM. THE PUMP IS ON THE L RAIL ALONG WITH APPEARS TO BE A LARGE IN LINE FILTER.I HOPE SOMEONE CAN OFFER SOME HELP,BEFORE I OFFER UP MORE COIN TO THE FORD GOD.WHAT IS IT WITH BRONCOS ANYWAY.CASE OF BEER TO WHOEVER HELPS ME GET THIS FIXED.

BRONCO JIM

 

[grande_guerre]

have you changed the all the fuel filters? just an idea.

 

[4xfan78]

Sounds like the fuel pressure regulator to me. Most of the time there is a shrader valve on the fuel rail, you can put a gauge on it and find out what the pressure is.

 

[Gunner]

yeah sounds like the fuel pressure regulator to me to. but now that this is posted in the right section you should get more replies.

 

[BRONCO JIM]

THANX PEOPLE,GOING TO GET PRESS.REG, & FILTER TODAY,WILL LET YOUS KNOW ,ONLY THING i CAN T FIGURE IS WHY PUMP IS SO LOUD AND ON ALL THE TIME ?

 

[Txquadhunter]

A failing pump can be loud. But your pumps are getting over worked due to a stopped up filter can cause it to be loud. When you turn your key on and the pump don't stop after a secound or 2. Means it's a pressure problem. The pump should shut off when the right pressure is built up. if not the pump will keep pumping. So check the Pressure Reg. bad injector's or fuel rail bleeding down not allowing pressure to build.

 

[southerntrax]

and in doing all of that checking and replaceing parts put some fuel infector cleaner in your tank. just so you know that everything has been gone over real good.

 

[BRONCO JIM]

THANX FOR THE INFO,HAVEN T GOTTEN TO DO ANYTHING YET,BUT WILL PROBABLY GET TO THINGS NEXT WEEK. AM THINKING WILL REPLACE INLINE FILTER AND PRESS.VALVE FIRST.WILL CHECK FOR ALL FILTERS,.DOES ANYONE KNOW IF I CAN SAFELY BLOW OUT RETURN LINE TO TANK,OR WILL IT HURT THAT RESIVORE THINGY ON THE RAIL. IF THIS DON T WORK,WILL REPLACE PUMP,BUT THATS BIGGER BUCKS. INJECTERS ARE NEW (2 YRS) AND I DON T THINK ALL WOULD GO BAD AT ONCE.(ALL PLUGS WERE BLACK)WILL POST WHEN I GET TO THINGS. THANX AGAIN ! BJ

 

[BRONCO JIM]

/emoticons/[email protected] 2x" width="20" height="20" /> THANX.GUYS.TODAY I REPLACED THE FUEL PRESS.REG,AND FUEL FILTER,AND FOR GOOD MEASURE INSTALLED A NEW THROT.POSIT.SENS. TRUCK RUNS LIKE BRAND NEW,AND I MEAN BETTER THAN FOR YEARS !. CAN T WAIT TO DRIVE IT MORE NOW THAT ITS RUNNING SO WELL. HARD TO BELIEVE THAT THE PRESSURE REGULATOR WOULC CAUSE SO MUCH TROUBLE,GOT A NEW ONE AT AUTOZONE FOR $17.OO,WHICH IS LESS THAN HALF ANYWHERE ELSE. GOTTA POST SOMETHING NEW NOW. LATER

 

[BRETS_BRONCO]

/emoticons/[email protected] 2x" width="20" height="20" />

WTG JIM Nothing beats a Good running BRONC!