• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Relieving Fuel Pressure? 91 4.0L Ranger


srisitt

Member
Joined
Jun 1, 2019
Messages
58
Reaction score
8
Points
8
Location
Washington
Vehicle Year
1991
Make / Model
Ford Ranger
Transmission
Manual
How do you release the fuel pressure on a 91 4.0L? In my chilton manual it says I need a special tool to release the valve at the engine block, but some things I read online say to disconnect the fuel pump relay via a connector underneath the fuse box. I looked inside the fuse box and found a 30A fuse labeled for the fuel relay, if I disconnect this will it relieve fuel pressure?
 


fastpakr

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
7,991
Reaction score
2,792
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
Disconnecting that and cranking would certainly do it. You could also wrap a rag around the shrader valve on the fuel rail (looks like a tire valve stem) and press the valve in so any pressurized fuel soaks into the rag.
 

rusty ol ranger

Im a Jeep guy now.
Supporting Member
Joined
Sep 22, 2007
Messages
12,267
Reaction score
7,274
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
I just yank the relay/fuse, fire it up, let it run till it stalls, then get to work.
 

srisitt

Member
Joined
Jun 1, 2019
Messages
58
Reaction score
8
Points
8
Location
Washington
Vehicle Year
1991
Make / Model
Ford Ranger
Transmission
Manual
Disconnecting that and cranking would certainly do it. You could also wrap a rag around the shrader valve on the fuel rail (looks like a tire valve stem) and press the valve in so any pressurized fuel soaks into the rag.
Interesting, is there an additional relay underneath the fuse box then or is it just the fuse on the 91? I heard there’s a green relay that snaps to a connecter under there
 

fastpakr

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
7,991
Reaction score
2,792
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
I'm surprised the relay isn't visible from the top of the fuse/relay box.
 

srisitt

Member
Joined
Jun 1, 2019
Messages
58
Reaction score
8
Points
8
Location
Washington
Vehicle Year
1991
Make / Model
Ford Ranger
Transmission
Manual
I'm surprised the relay isn't visible from the top of the fuse/relay box.
Yeah, in a video I saw it’s underneath, you have to remove the fuse box to get to it. But the fuel relay fuse is right in the box and labeled on the lid.
 

fastpakr

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
7,991
Reaction score
2,792
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
That ought to work as well.
 

rusty ol ranger

Im a Jeep guy now.
Supporting Member
Joined
Sep 22, 2007
Messages
12,267
Reaction score
7,274
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Or if youre really feelin froggy you can trip/unplug the inertia switch.
 

fastpakr

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
7,991
Reaction score
2,792
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16
The inertia switch isn't really designed to be used more than once.
 

snoranger

Professional money waster
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
RBV's on Boost
ASE Certified Tech
VAGABOND
TRS Event Participant
GMRS Radio License
Joined
Nov 25, 2007
Messages
13,053
Reaction score
13,526
Points
113
Location
Jackson, NJ
Vehicle Year
'79,'94,'02,'23
Make / Model
All Fords
Engine Type
2.3 EcoBoost
Transmission
Automatic
2WD / 4WD
4WD
My credo
I didn't ask for your life story, just answer the question!

ericbphoto

Overlander in development
TRS Event Staff
TRS Forum Moderator
Supporting Member
U.S. Military - Veteran
TRS 20th Anniversary
VAGABOND
TRS Event Participant
GMRS Radio License
Joined
Feb 7, 2016
Messages
15,212
Reaction score
16,346
Points
113
Age
59
Location
Wellford, SC
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
3.0 V6
Engine Size
3.0L
Transmission
Manual
2WD / 4WD
4WD
Total Lift
6"
Tire Size
35"
My credo
In theory, theory and practice are the same. In practice, they are different.
Then why did they put a reset button on it?
Same reason they put "wet paint" signs on something that has just been painted. " To make people touch it"
 

rusty ol ranger

Im a Jeep guy now.
Supporting Member
Joined
Sep 22, 2007
Messages
12,267
Reaction score
7,274
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
The inertia switch isn't really designed to be used more than once.
Either is toilet paper. But there are those amongst us.
 

fastpakr

Forum Staff Member
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
U.S. Military - Veteran
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
7,991
Reaction score
2,792
Points
113
Location
Roanoke, VA
Vehicle Year
1999
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Automatic
2WD / 4WD
4WD
Tire Size
285/75-16

snoranger

Professional money waster
TRS Event Staff
TRS Forum Moderator
Supporting Member
Article Contributor
RBV's on Boost
ASE Certified Tech
VAGABOND
TRS Event Participant
GMRS Radio License
Joined
Nov 25, 2007
Messages
13,053
Reaction score
13,526
Points
113
Location
Jackson, NJ
Vehicle Year
'79,'94,'02,'23
Make / Model
All Fords
Engine Type
2.3 EcoBoost
Transmission
Automatic
2WD / 4WD
4WD
My credo
I didn't ask for your life story, just answer the question!

rusty ol ranger

Im a Jeep guy now.
Supporting Member
Joined
Sep 22, 2007
Messages
12,267
Reaction score
7,274
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
To get it away from an accident.
The purpose of the inertia switch is to kill the pump in case of an accident, in order to prevent fuel spillage and/or fire.

So, since they put a reset on it in order to drive it from an accident, doesnt it kind of defeat the purpose if fuel really was leaking?
 

Sponsored Ad


Sponsored Ad

Staff online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top