fuel pressure
Thread Starter
|
New User
Joined: Jul 2020
Posts: 2
Likes: 0
fuel pressure
Hi all
I have a 1999 E450 V10 RV with a problem. I am loosing fuel line pressure after sitting for about a week.Looking over the motor I don't see a schrader valve on the fuel rail. Did Ford eliminate it? If it is there, please post a picture. And if is not there, where is the best place to connect a fuel pressure gauge. At the fuel filter?
thanks
Al
I have a 1999 E450 V10 RV with a problem. I am loosing fuel line pressure after sitting for about a week.Looking over the motor I don't see a schrader valve on the fuel rail. Did Ford eliminate it? If it is there, please post a picture. And if is not there, where is the best place to connect a fuel pressure gauge. At the fuel filter?
thanks
Al
Tuned
Joined: Sep 2018
Posts: 385
Likes: 19
Losing fuel line pressure after a week sitting is pretty normal.
Does it run well?
is it just a long crank after sitting ? You can cycle the key a couple times after a long sit. It will prime the fuel system and reduce crank time.
It could also also be a weak check valve in fuel pump but if it takes a week to bleed down it still seems to me pretty normal.
The fuel rail rail is chrome and on the passenger side near the rear of motor is a schrader valve. Borrow a test kit from your favorite auto parts store and do a few tests. Pull it up back of hood and tape it to windshield so you can see while driving. It should jump up around 35 psi quickly and while driving maintain that or go up to 40+ when you floor it.
You can check overnight bleed down pressure but that is somewhat normal too.
I have a 99 build v10 and just recently changed the battery. It was starting ok but was getting old and weak. I was amazed how much more quickly it has started with a fresh large battery. Not just cranking speed but how quickly it catches and how it hasn’t had a stumble start after sitting. I have wondered if the fuel pump likes the higher voltage while cranking. (Less voltage drop)
Does it run well?
is it just a long crank after sitting ? You can cycle the key a couple times after a long sit. It will prime the fuel system and reduce crank time.
It could also also be a weak check valve in fuel pump but if it takes a week to bleed down it still seems to me pretty normal.
The fuel rail rail is chrome and on the passenger side near the rear of motor is a schrader valve. Borrow a test kit from your favorite auto parts store and do a few tests. Pull it up back of hood and tape it to windshield so you can see while driving. It should jump up around 35 psi quickly and while driving maintain that or go up to 40+ when you floor it.
You can check overnight bleed down pressure but that is somewhat normal too.
I have a 99 build v10 and just recently changed the battery. It was starting ok but was getting old and weak. I was amazed how much more quickly it has started with a fresh large battery. Not just cranking speed but how quickly it catches and how it hasn’t had a stumble start after sitting. I have wondered if the fuel pump likes the higher voltage while cranking. (Less voltage drop)
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
With all the fuel pump failures I've worked through with family and friends over the years, I'm beginning to wonder if the root of their problems were because of a dead (or going dead) battery. Below is an extreme example of how the commutator looks are being beaten to death.
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
With all the fuel pump failures I've worked through with family and friends over the years, I'm beginning to wonder if the root of their problems were because of a dead (or going dead) battery. Below is an extreme example of how the commutator looks are being beaten to death.
Another thing often not mentioned is possible pump over heating if the tank is continually run will less than 1/4 full. I can't say definitively this avoids all fuel pump failures but its something to consider.
Last edited by krewat; Jul 17, 2020 at 04:07 PM. Reason: fixed the quoting
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Can't see why it would be a protected image but I've snagged it for my records too---good to show what happens to parts after 100K or more miles.
Trending Topics
Moderator
Joined: May 2004
Posts: 6,521
Likes: 919
From: Home Base Nebraska
Denny
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
Denny I've been filling up at 1/4 tank for maybe 15 years now, had good luck until I didn't one fateful day........
Had just pulled out of a customers garage heading home when about 500' later my '03 E250 gasser with just over 255K miles died---I knew it was the fuel pump after a few quick tests and finding a DTC indicating failure to pressurize the fuel system. Up until that point there were absolutely no warning signs at all. I'd practiced the 1/4 thank re-fill since it came to live with me @ 165K miles. Of the 5-6 modular motor vans I've had or driven since 2000 or so that's the first fuel pump issue I've had---not a bad track record overall I'm thinking.
Had just pulled out of a customers garage heading home when about 500' later my '03 E250 gasser with just over 255K miles died---I knew it was the fuel pump after a few quick tests and finding a DTC indicating failure to pressurize the fuel system. Up until that point there were absolutely no warning signs at all. I'd practiced the 1/4 thank re-fill since it came to live with me @ 165K miles. Of the 5-6 modular motor vans I've had or driven since 2000 or so that's the first fuel pump issue I've had---not a bad track record overall I'm thinking.
Thread
Thread Starter
Forum
Replies
Last Post
rangerlugnut
1968-Present E-Series Van/Cutaway/Chassis
2
May 22, 2017 12:38 AM