No fuel pressure?!?
Thread Starter
|
New User
Joined: Dec 2015
Posts: 4
Likes: 0
No fuel pressure?!?
1989 f150 4.9l 2wd lariat with dual tanks
I am a first-time poster, tapping out to a fuel issue! I was driving down the road, truck wasn't getting enough gas sputtered badly then died. Got it towed home (thanks roadside assistance!). Replaced the in-line fuel pump and fuel filter.
I still cannot get any pressure to the fuel rail. I disconnected the hose from the in-line pump to the reservoir, put it into a gas can, and the in-line pump pressure rises rail perfectly. So I know it has to be upstream of the reservoir. I can hear both the front and the rear tanks pumps running when I turn the key on. However, when I disconnect the front and rear fuel lines from the reservoir, neither one in pumps fuel out of the lines.
it has me really confused! Is it possible that both my front and rear in tank pumps went out at the exact same time? To where they would be able to run, but supply zero fuel? What else could it be?
I have checked voltage to the front in tank Pump and it is a perfect 12 V.
I am a first-time poster, tapping out to a fuel issue! I was driving down the road, truck wasn't getting enough gas sputtered badly then died. Got it towed home (thanks roadside assistance!). Replaced the in-line fuel pump and fuel filter.
I still cannot get any pressure to the fuel rail. I disconnected the hose from the in-line pump to the reservoir, put it into a gas can, and the in-line pump pressure rises rail perfectly. So I know it has to be upstream of the reservoir. I can hear both the front and the rear tanks pumps running when I turn the key on. However, when I disconnect the front and rear fuel lines from the reservoir, neither one in pumps fuel out of the lines.
it has me really confused! Is it possible that both my front and rear in tank pumps went out at the exact same time? To where they would be able to run, but supply zero fuel? What else could it be?
I have checked voltage to the front in tank Pump and it is a perfect 12 V.
Thread Starter
|
New User
Joined: Dec 2015
Posts: 4
Likes: 0
I agree you're right. Need to get tanks down to better isolate. My biggest hangup is how do both screens get clogged in both tanks at the same time when neither had any issues two days ago?!? Did I just find Bigfoot?
Could it be a priming issue? My understanding is that should not be a thing but…
Could it be a priming issue? My understanding is that should not be a thing but…
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
I agree you're right. Need to get tanks down to better isolate. My biggest hangup is how do both screens get clogged in both tanks at the same time when neither had any issues two days ago?!? Did I just find Bigfoot?
Could it be a priming issue? My understanding is that should not be a thing but…
Could it be a priming issue? My understanding is that should not be a thing but…
Thread Starter
|
New User
Joined: Dec 2015
Posts: 4
Likes: 0
Switch seems to work fine. Verified front gets 12v when switch is on that tank. Can hear both front and rear pumps running according to switch selection... And I have efi so have the mechanical reservoir instead of electric tank selector valve.
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
I did run into a problem once of having an in-tank pump that was failing and it pumped just enough fuel to open one poppet in the selector/resivoir but not the other. It was pumping fuel around in a circle but not to the frame pump. That selector canister may have a filter in it. Some say "Non-serviceable. Do not remove" but they lie! When you remove the bowl, be extremely careful with the o-ring. You cannot buy a new one, it IS a non serviced part! If there is a filter in it, just take it out and throw it away.
Thread Starter
|
New User
Joined: Dec 2015
Posts: 4
Likes: 0
I tried to open it with a filter wrench but it is TIGHT! Didn't want to break plastic. How did you get yours off?
Also I can pull the tank side lines from the canister and still the fur pumps don't spit any due out.
Also I can pull the tank side lines from the canister and still the fur pumps don't spit any due out.
Trending Topics
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
Not even a drop? From either tank? And they are running, right? Not saying it can't happen, but for both to die at the same time is not very common!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Thread
Thread Starter
Forum
Replies
Last Post
Hazmat 67
Fuel Injection, Carburetion & Fuel System
13
Dec 2, 2019 01:32 PM
AAAAAHAB
1987 - 1996 F150 & Larger F-Series Trucks
16
Feb 22, 2015 12:18 PM
tezm
1987 - 1996 F150 & Larger F-Series Trucks
5
Oct 18, 2002 06:56 PM