Fuel Pump Pressure?
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 354
Likes: 9
Fuel Pump Pressure?
'00 7.3 PSD in a F250 4x4 SC, 265,000 miles, Rotella Synthetic Oil, WIX Filters, 50 cent mod, Truck runs good, easy start up, good power.... Now that winter is just a few months away, I've decided to do some maintenance on the 7.3. My main concern is MPG's suck. They are hovering in the the 13.5 highway and less in town. Last year, on one trip, I got 19.2 hwy, came home fueled at same station, 2 days later took another hwy trip, 13.8 mpg (same driving habits)... Why such a drop? I've checked the entire exhaust, no signs of soot or exhaust leaks, no signs of turbo pressure leaks around the boots or intercooler. Engine is dry on top....
The only thing I can think of is the lift pump may be getting weak and not supplying the volume or pressure needed for the injectors to operate efficiently. (is this thought process accurate?) What is the needed fuel pressure at the fuel filter bowl?
And, I haven't spent the $$ on a set of gauges either, even though I know they are a necessary expense.
Any and all suggestions appreciated.
The only thing I can think of is the lift pump may be getting weak and not supplying the volume or pressure needed for the injectors to operate efficiently. (is this thought process accurate?) What is the needed fuel pressure at the fuel filter bowl?
And, I haven't spent the $$ on a set of gauges either, even though I know they are a necessary expense.
Any and all suggestions appreciated.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Before you worried about fuel pressure issues, here is a good MPG thread with common issues like Up-pipes, EBPS cleaning, etc https://www.ford-trucks.com/forums/1...ght=MPG+thread
2 days and that much different I would think there is something else going on, hand calculated or trip computer? Did you get the same quantity of fuel in the tank, If you haven't done the Harpoon mod this can vary up to 5 gallons, making your numbers off too.
2 days and that much different I would think there is something else going on, hand calculated or trip computer? Did you get the same quantity of fuel in the tank, If you haven't done the Harpoon mod this can vary up to 5 gallons, making your numbers off too.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 354
Likes: 9
Old school accurate, by paper and calculator.. no lieometer here.... I try to clean the EBPS everytime I change the oil..(since it's a problem area). As far a fuel quality, who knows what we are getting in fuel.(and how would you know unless it's something obvious?)
I see no soot around the up pipes,,, I suppose if they were bleeding pressure there would be signs of it?
I see no soot around the up pipes,,, I suppose if they were bleeding pressure there would be signs of it?
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Quality can make a difference, but I said Quantity, the amount of fuel, do you fill to the same position each time, or just let it click off? If you let it click off, you would be surprised how much foaming can vary between different stations or pumps.
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 354
Likes: 9
My apologies,,, I misread... I try to allow the fuel / foam to settle before I'm done fueling and fill the same point each time. What exactly is the Harpoon Mod. Just looked for it and link wouldn't work.
Everyone talks about the "up-pipes" being an issue.. If they were leaking, wouldn't I easily see signs of such (soot, minor smoke at idle). And the turbo pipe boots, what's their "signs" of leakage other than obvious oil everywhere?
Everyone talks about the "up-pipes" being an issue.. If they were leaking, wouldn't I easily see signs of such (soot, minor smoke at idle). And the turbo pipe boots, what's their "signs" of leakage other than obvious oil everywhere?
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 354
Likes: 9
Trending Topics
Postmaster
Joined: Jan 2009
Posts: 4,006
Likes: 1
From: AL, Reform
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
Laughing Gas
Joined: Feb 2004
Posts: 822
Likes: 9
From: Leander Texas
Hutch and Harpoon mods
http://www.guzzle7pt3.com/harpoon.html
Welcome to guzzle's In-tank Hutch Mod Web Page
http://www.guzzle7pt3.com/harpoon.html
Welcome to guzzle's In-tank Hutch Mod Web Page
Thread Starter
|
Tuned
Joined: Feb 2006
Posts: 354
Likes: 9
Thanks izzybird, I now remember the harpoon mod...
the Hutch mod speaks of the pre-pump fuel filter, does any know the part number of that assembly or another brand that's just as good and the approx. prices of either.? Thanks,
the Hutch mod speaks of the pre-pump fuel filter, does any know the part number of that assembly or another brand that's just as good and the approx. prices of either.? Thanks,
Elder User
Joined: Feb 2006
Posts: 765
Likes: 1
From: Eastern Ohio
You may want to find out your ICP. My truck dropped from 18 to 12 MPG. Because of very low ICP. (900 psi, 98%DC at WOT) I haven't found the cause yet, but I am down to a leak in the heads or HPOP.
Laughing Gas
Joined: Feb 2004
Posts: 822
Likes: 9
From: Leander Texas
I like Strictly Diesels kit so I don't have to go gather up parts. They offer a spin on filter if you want it. Around $80 without filter.
Driven Diesel 7.3L Fuel Tank / Pre-Pump Kit
Driven Diesel 7.3L Fuel Tank / Pre-Pump Kit
Thread
Thread Starter
Forum
Replies
Last Post
firemediceric
1999 - 2003 7.3L Power Stroke Diesel
27
Dec 12, 2009 01:46 PM
pexhere
1999 - 2003 7.3L Power Stroke Diesel
10
Oct 16, 2006 06:40 PM
