i think my fuel pump is going bad

ozziesironmanoffroad · 09-23-2007, 09:37 PM

i have to give it a lot of gas to keep it running when i start it, every time,no matter if its warm or cold, and it wont idle unless i revv it up really high, then it chugs, but idles. could this be the work of the fuel pump, or a sensor?

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ozziesironmanoffroad · 09-23-2007, 11:15 PM

anyone have any ideas of what it could be?

stormin94 · 09-23-2007, 11:31 PM

I'm not sure, but having 250,000 miles on your truck probably doesn't help things either.

I dunno, Check for vacuum leaks.

fillsrunner4 · 09-23-2007, 11:32 PM

maybe the fuel filter perhaps. you could undo the line pre filter and turn the key and see if its pumping fuel and if its not then yeah its proibably the pump but I would do that check before you go by a new one. save some $$$

corvey · 09-23-2007, 11:38 PM

I don't think it's the fuel pump. In fuel injected engines, the fuel pump is a very high PSI pump so it can be forced through the injectors and be atomized correctly. I think a fuel pump would fail completely and therefor would not work at all. I would tend to think it would be clogged injectors before thinking it was a fuel pump.

Most likely I think your problem is probably just a vacuum line has come loose somewhere.

ozziesironmanoffroad · 09-24-2007, 05:32 AM

ok will check. if i have time at work ill clean out the injectors and will see whats going on. thanks

ozziesironmanoffroad · 09-24-2007, 05:39 AM

OH.... something just popped in my mind... im gonna be checkin the MAF too. when the MAF kept disconnecting itself a year ago, it would do this. its tight, but i think it may be dirty. will let every1 know.

mt_goat · 09-24-2007, 05:42 AM

Quote:

Originally Posted by fillsrunner4

maybe the fuel filter perhaps. you could undo the line pre filter and turn the key and see if its pumping fuel and if its not then yeah its proibably the pump but I would do that check before you go by a new one. save some $$$

I agree.

sometoyotaguy · 09-24-2007, 05:51 AM

how's your timing chain?

mt_goat · 09-24-2007, 05:52 AM

Quote:

Originally Posted by ozziesironmanoffroad

OH.... something just popped in my mind... im gonna be checkin the MAF too. when the MAF kept disconnecting itself a year ago, it would do this. its tight, but i think it may be dirty. will let every1 know.

A MAF or mass air flow sensor will get dirty very easy and the small heated wire needs cleaning sometimes, but 86-95 trucks don't have MAFs, they use a VAFM or a volume air flow meter which is sealed up and just uses a flap door to estimate the volume of air.

ozziesironmanoffroad · 09-24-2007, 06:14 AM

mine has a big sensor right on the air box. last time i didnt have it hooked up properly it did this. so VAFM or MAF, im gonna check it out, clean the injectors, and check for vacuum leaks.

skife · 09-24-2007, 10:17 AM

check the vacuum line that goes into the fuel pressure regulator, its on the back of the motor if its a 22RE.

it could very well be a fuel pump though, i just replaced mine.

to whoever said the fuel pump is pumping at a really high pressure, your wrong.
the pressure is between 27-31psi.

when my pump went bad it would run and drive, but bog way way down and stuff. is the motor throwing any codes?

corvey · 09-24-2007, 12:00 PM

Quote:

Originally Posted by skife

check the vacuum line that goes into the fuel pressure regulator, its on the back of the motor if its a 22RE.

it could very well be a fuel pump though, i just replaced mine.

to whoever said the fuel pump is pumping at a really high pressure, your wrong.
the pressure is between 27-31psi.

when my pump went bad it would run and drive, but bog way way down and stuff. is the motor throwing any codes?

30-45 psi fuel pump for fuel injection is very high compared to a carb'ed system. Compare the two and you will see it's at least 4x-10x PSI greater in most compared systems... If you put a fuel pump made for a carb system on a fuel injection system, it will not work!

He has already noted that he can rev really high, so fuel delivery is there, so it's not the fuel pump IMO...

ozziesironmanoffroad · 09-24-2007, 10:00 PM

Quote:

Originally Posted by skife

check the vacuum line that goes into the fuel pressure regulator, its on the back of the motor if its a 22RE.

it could very well be a fuel pump though, i just replaced mine.

to whoever said the fuel pump is pumping at a really high pressure, your wrong.
the pressure is between 27-31psi.

when my pump went bad it would run and drive, but bog way way down and stuff. is the motor throwing any codes?

i dont have a machine to read any codes, but it prob would read a code saying the cold start injector is not working, since i have it disconnected until i buy a new wiring harness and new sensors. any idea where i could buy a code reader? and what type should i buy? i know not obd1 or something...

corvey · 09-25-2007, 03:52 AM

Is your check engine light on? You can have it read for free at Autozone or Advanceauto.

mt_goat · 09-25-2007, 04:24 AM

Quote:

Originally Posted by corvey

Is your check engine light on? You can have it read for free at Autozone or Advanceauto.

They can't read pre OBDII vehicles, but he can do it with a paper clip. I can't remember which pins you stick the paper clip but its been posted on here before.

thook · 09-25-2007, 04:56 AM

http://www.off-road.com/toyota/tech/codes/index.html

corvey · 09-25-2007, 05:30 AM

^ sweet link

Learn somthing new every day

ozziesironmanoffroad · 09-29-2007, 05:44 AM

ok there wasnt much wrong, my mechanic said my throttle body was a little dirty, and i DID have a vacuum leak. he did both. runnin like a champ now.. i just cant believe how much power it still has for 251,000 miles, i can burn rubber like no tomorrow with it if i truly wanted to. leavin da civics in shame.

. ok, time to start replacing sensors and pumps anyway. call it '250,000 mile work/tuneup'. thanks to everyone on here who responded.

09-23-2007, 11:15 PM	#2 (permalink)
ozziesironmanoffroad Registered User Join Date: Sep 2007 Location: Spring Valley, CA Posts: 5,676	anyone have any ideas of what it could be? __________________ The 22r series engines are made from the fires of hell, and will fight tooth and nail to not be sent back. 1988 Toyota P/U 4x4 22re, 1200 miles on the rebuild engine builder .268 cam pioneer CD deck 31x10.50x15 BFG A/T BAJA 100W lights on prerunner bumper KC Daylighters 100W rancho rs5000 MUD IS A VALID PAINT JOB! If not living life to the fullest, why live it? my trucks official buildup thread

09-23-2007, 11:31 PM	#3 (permalink)
stormin94 Contributing Member Join Date: Jun 2007 Location: Lake County, CA/Sacramento Posts: 3,535	I'm not sure, but having 250,000 miles on your truck probably doesn't help things either. I dunno, Check for vacuum leaks. __________________ 1994 Toyota 4Runner SR5 4X4 213,000 miles and counting 3.0 V6, 5 speed 10/15 MPG city/hwy(with 33's) Current Mods Headers, 2.5" Flowmaster custom exhaust, K&N FIPK KC Daylighter 100 Watt lights Ranchos x4, 2" Lift Downey coils 33-12.50 M/T's, 1" t-bar lift, 1" body lift Tow pkg w/ lighthookups Silverstar Headlights, Pioneer Deck w/XM Brushguard 250Watt JLAudio 8" W3 Sub Future Mods 12V Aux outlet-400/800peak inverter roof basket/lights Air locker 4.88 gears H.O. Alternator

09-23-2007, 11:32 PM	#4 (permalink)
fillsrunner4 Registered User Join Date: Jun 2004 Location: Sammamish, wa Posts: 2,724	maybe the fuel filter perhaps. you could undo the line pre filter and turn the key and see if its pumping fuel and if its not then yeah its proibably the pump but I would do that check before you go by a new one. save some $$$ __________________ 94' toyota 4runner (Many a change!) purchased bone stock, NOW... SAS, 39" Iroks, Rear Leafswap, 5.29's , Air locked front, Welded rear, Chevy 4.3L V6, 5spd swap, dual T/C's MC10R10, flatbelly with custom skids, sliders, Chopped, Bobbed and so much more. Might as well start reading this if ya want know more Fillsrunner4 3.4crawler Build Thread Fillsrunner4.3 crawler (Part Two) build thread

09-23-2007, 11:38 PM	#5 (permalink)
corvey Registered User Join Date: Aug 2007 Posts: 211	I don't think it's the fuel pump. In fuel injected engines, the fuel pump is a very high PSI pump so it can be forced through the injectors and be atomized correctly. I think a fuel pump would fail completely and therefor would not work at all. I would tend to think it would be clogged injectors before thinking it was a fuel pump. Most likely I think your problem is probably just a vacuum line has come loose somewhere. __________________ 1990 4x4Runner 3.S0LD "I just saved a bunch of money on my 4runner by switching to Yotatech"

09-24-2007, 05:32 AM	#6 (permalink)
ozziesironmanoffroad Registered User Join Date: Sep 2007 Location: Spring Valley, CA Posts: 5,676	ok will check. if i have time at work ill clean out the injectors and will see whats going on. thanks __________________ The 22r series engines are made from the fires of hell, and will fight tooth and nail to not be sent back. 1988 Toyota P/U 4x4 22re, 1200 miles on the rebuild engine builder .268 cam pioneer CD deck 31x10.50x15 BFG A/T BAJA 100W lights on prerunner bumper KC Daylighters 100W rancho rs5000 MUD IS A VALID PAINT JOB! If not living life to the fullest, why live it? my trucks official buildup thread

09-24-2007, 05:39 AM	#7 (permalink)
ozziesironmanoffroad Registered User Join Date: Sep 2007 Location: Spring Valley, CA Posts: 5,676	OH.... something just popped in my mind... im gonna be checkin the MAF too. when the MAF kept disconnecting itself a year ago, it would do this. its tight, but i think it may be dirty. will let every1 know. __________________ The 22r series engines are made from the fires of hell, and will fight tooth and nail to not be sent back. 1988 Toyota P/U 4x4 22re, 1200 miles on the rebuild engine builder .268 cam pioneer CD deck 31x10.50x15 BFG A/T BAJA 100W lights on prerunner bumper KC Daylighters 100W rancho rs5000 MUD IS A VALID PAINT JOB! If not living life to the fullest, why live it? my trucks official buildup thread

09-24-2007, 05:51 AM	#9 (permalink)
sometoyotaguy Registered User Join Date: Sep 2007 Posts: 16	how's your timing chain?

09-24-2007, 06:14 AM	#11 (permalink)
ozziesironmanoffroad Registered User Join Date: Sep 2007 Location: Spring Valley, CA Posts: 5,676	mine has a big sensor right on the air box. last time i didnt have it hooked up properly it did this. so VAFM or MAF, im gonna check it out, clean the injectors, and check for vacuum leaks. __________________ The 22r series engines are made from the fires of hell, and will fight tooth and nail to not be sent back. 1988 Toyota P/U 4x4 22re, 1200 miles on the rebuild engine builder .268 cam pioneer CD deck 31x10.50x15 BFG A/T BAJA 100W lights on prerunner bumper KC Daylighters 100W rancho rs5000 MUD IS A VALID PAINT JOB! If not living life to the fullest, why live it? my trucks official buildup thread

09-24-2007, 10:17 AM	#12 (permalink)
skife Registered User Join Date: Feb 2007 Location: cedar springs mi/lima oh Posts: 206	check the vacuum line that goes into the fuel pressure regulator, its on the back of the motor if its a 22RE. it could very well be a fuel pump though, i just replaced mine. to whoever said the fuel pump is pumping at a really high pressure, your wrong. the pressure is between 27-31psi. when my pump went bad it would run and drive, but bog way way down and stuff. is the motor throwing any codes? __________________ '92 toyota truck 22re, header, 5 speed. 3" body lift, 31" michilin tires 26mm torsion NIB(box of the truck that is) needs some TLC clean body, i paied $400

09-25-2007, 03:52 AM	#15 (permalink)
corvey Registered User Join Date: Aug 2007 Posts: 211	Is your check engine light on? You can have it read for free at Autozone or Advanceauto. __________________ 1990 4x4Runner 3.S0LD "I just saved a bunch of money on my 4runner by switching to Yotatech"

09-25-2007, 05:30 AM	#18 (permalink)
corvey Registered User Join Date: Aug 2007 Posts: 211	^ sweet link Learn somthing new every day __________________ 1990 4x4Runner 3.S0LD "I just saved a bunch of money on my 4runner by switching to Yotatech"

09-29-2007, 05:44 AM	#19 (permalink)
ozziesironmanoffroad Registered User Join Date: Sep 2007 Location: Spring Valley, CA Posts: 5,676	ok there wasnt much wrong, my mechanic said my throttle body was a little dirty, and i DID have a vacuum leak. he did both. runnin like a champ now.. i just cant believe how much power it still has for 251,000 miles, i can burn rubber like no tomorrow with it if i truly wanted to. leavin da civics in shame. . ok, time to start replacing sensors and pumps anyway. call it '250,000 mile work/tuneup'. thanks to everyone on here who responded. __________________ The 22r series engines are made from the fires of hell, and will fight tooth and nail to not be sent back. 1988 Toyota P/U 4x4 22re, 1200 miles on the rebuild engine builder .268 cam pioneer CD deck 31x10.50x15 BFG A/T BAJA 100W lights on prerunner bumper KC Daylighters 100W rancho rs5000 MUD IS A VALID PAINT JOB! If not living life to the fullest, why live it? my trucks official buildup thread

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