fuel pressure
Thread Starter
|
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
fuel pressure
ANother ? guys. Installed my f/p gauge, and at idle and normal driving, zf6, not into the turbo...etc, seeing 68/69 psi. With heavy foot, into the turbo, the pressure drops to 62/63 psi. The second i let off, it climbs back to 68/69 psi. Is this right/in the "ballpark"?
Postmaster
Joined: Sep 2007
Posts: 4,005
Likes: 3
From: Mcafee, NJ
pass side is post filter and those are some good numbers
when iu did mine i replaced the fuel filter at the same time so i had a base number and if i saw it drop more psi than normal i knew it was time to replace the fuel filter
when iu did mine i replaced the fuel filter at the same time so i had a base number and if i saw it drop more psi than normal i knew it was time to replace the fuel filter
Thread Starter
|
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Appreciate the info, Jim. The filter, both bowl and pre-pump were replaced about 4k mles ago. Now with the gauge, you gave me an answer as to when its a good time to replace either or/both...thanks man.
Thread Starter
|
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Well, yesterday, had a chance to run her. At idle, its at 68-70psi, and into the turbo, she falls to 62/63psi, then bac kup, once let off. I did notice though, while b.s.ing with my bro, with truck idling, and it was warmed up to operating temp, that one moment, the needle spiked to 75-78ish psi, and when it did this, the truck had a little "shimmy" to it, then nuetralized out, back to 68-70psi. That "shimmy", was only for about a second or 2. Prior to F/P gauge install, the truck has always done that "shimmy" from time to time, at idle, not ALL the time, but here and there. But now with a gauge, noticed it, and so did the gauge. Wondering now, if something aint right, somewhere? You guys gotta idea?
My pre-pump filter is 30micron, just incase ? was asked. And both filters were replaced about 5-8k ago.
My pre-pump filter is 30micron, just incase ? was asked. And both filters were replaced about 5-8k ago.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
Your numbers are what I see doing the same tests. I have not seen a 75 psi spike, but If you are hard on it and let off, I can easily see that happening though.
Trending Topics
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
Are you sure you are not chasing ghosts? Unless you see it repeatably I would leave it alone. The shimmy you felt could be many things, a 5-8 psi increase in the fuel pressure doesn't seem like it would be one of them.
You can pull it apart and make sure it is clean and burr free. If you find something wrong you can get a rebuild kit from Clay or Bob. FPR Rebuild Kit
The brass poppet has a seal on it that keeps it from leaking when seated.
You can pull it apart and make sure it is clean and burr free. If you find something wrong you can get a rebuild kit from Clay or Bob. FPR Rebuild Kit
The brass poppet has a seal on it that keeps it from leaking when seated.
Thread Starter
|
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Alright.....i'll watch the gauge more tomorrow. i'll be doing about 200 miles, so, i'll take a gander. Gotta few buks, so wanted to get a few things. Got g.p.'z, and was think'n, since in there, to install new pushrods, along with an AD where the longlead inj. is. Got this darn tick/tap noise, at idle
Thread Starter
|
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Been a few days for a follow up, and think it had to do something with the fuel. Since then, i filled ur up, dumped in a bottle (32oz) of oil, and sit'n on 1/2 tank, but (knock on wood), it has yet to act up, on all sorts of driving conditions... :-)
