Fuel Pump problems..HELP!
Thread Starter
|
New User
Joined: Jun 2001
Posts: 6
Likes: 0
Fuel Pump problems..HELP!
I have a 89 Bll 2.9L. It acts like it isn't getting gas.. alot of the time.. other times it runs fine. Took it to a shop and they told me the fuel pressure was at 20 and was supposed to be at 35. Said my fuel pump was bad. I changed that out along with the fuel filter under the Bronco. It ran great for a week then started the same thing!When I changed the pump,I took the case the pump was inclosed in apart and ONLY changed the pump and filter. Think maybe that has something to do with it?
Posting Guru
Joined: Aug 2000
Posts: 1,984
Likes: 2
Fuel Pump problems..HELP!
420, Since this problem is intermittent, I don't think the pump case has anything to do with it. Your trouble could be in the fuel pump relay; I think it's on the passenger side fenderwell on your model. Good luck.
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
Thread Starter
|
New User
Joined: Jun 2001
Posts: 6
Likes: 0
Fuel Pump problems..HELP!
It's not on that fenderwall. Only fuse box and voltage regulator.I changed the fuel pressure valve yesterday with no luck. Was told also it might be the MAP sensor, thats on the firewall. I'm no mechanic so please give me some idea as to what it even looks like. Oh also when driving when it starts acting up.. if you let off the gas some, it does a little better for a few mins.If you give it gas, it wants to shut off. Usually it won't go over about 40 unless you manage to get up speed.
Posting Guru
Joined: Aug 2000
Posts: 1,984
Likes: 2
Fuel Pump problems..HELP!
420, the MAP sensor (manifold absolute pressure) is about 2"x2", has a plug wired into the wiring harness, and is almost at the level of the hood, the highest point in the engine compartment. It's on the firewall toward the center, but maybe slightly on the driver's side.
However, I don't think that is the problem. The symptoms you describe sounds like the MAF or speed density sensor. I think your model has the speed density type of fuel injection. This sensor is located on the air filter box, between the box and the throttle body, and also has an electrical connector.
These sensors get dirty and give an erratic throttle response, and a loss of power. To change it, you will need a "tamper-proof" allen wrench that auto parts stores sell. The sensor can also be cleaned with an O2 sensor safe throttle body cleaner. Sometimes cleaning works, sometimes it dosen't.
Hope some of this helps. Don
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
However, I don't think that is the problem. The symptoms you describe sounds like the MAF or speed density sensor. I think your model has the speed density type of fuel injection. This sensor is located on the air filter box, between the box and the throttle body, and also has an electrical connector.
These sensors get dirty and give an erratic throttle response, and a loss of power. To change it, you will need a "tamper-proof" allen wrench that auto parts stores sell. The sensor can also be cleaned with an O2 sensor safe throttle body cleaner. Sometimes cleaning works, sometimes it dosen't.
Hope some of this helps. Don
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
Thread Starter
|
New User
Joined: Jun 2001
Posts: 6
Likes: 0
Fuel Pump problems..HELP!
[font size="1" color="#FF0000"]LAST EDITED ON 16-Jun-01 AT 10:47 PM (EST)[/font][p]Changed out the fuel pump again today... It wouldn't even pump fuel.. So i went back and bought the whole case.. Installed it.. By the way i'm getting VERY good at fuel pump installations.. and it fired right up and drove without any problems! 3 pumps and i'm on the road again! Hope it lasts this time..
I was told the little rubber ring the pump sat in was losing the fuel pressure making the fuel return back into the tank.
Thanks you guys for all your help! Good to know i have a place to turn to for answers to my questions..
Kathy
I was told the little rubber ring the pump sat in was losing the fuel pressure making the fuel return back into the tank.
Thanks you guys for all your help! Good to know i have a place to turn to for answers to my questions..
Kathy
Trending Topics
Junior User
Joined: Oct 1999
Posts: 74
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski