Lost vacuum
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
Vacuum reserve canister: JEGS Vacuum Reserve Canister - JEGS for your brake issue.
As far as the low fuel pressure at times problem...probably running out of fuel supply. Perhaps a booster pump with a Hobbs switch that kicks in when the boost reaches XX psi would fit the bill?
As far as the low fuel pressure at times problem...probably running out of fuel supply. Perhaps a booster pump with a Hobbs switch that kicks in when the boost reaches XX psi would fit the bill?
Thread Starter
|
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
Vacuum reserve canister: JEGS Vacuum Reserve Canister - JEGS for your brake issue.
As far as the low fuel pressure at times problem...probably running out of fuel supply. Perhaps a booster pump with a Hobbs switch that kicks in when the boost reaches XX psi would fit the bill?
As far as the low fuel pressure at times problem...probably running out of fuel supply. Perhaps a booster pump with a Hobbs switch that kicks in when the boost reaches XX psi would fit the bill?
I had a Hobbs sw but now have a 255 lph fuel pump, should be enough.
Thread Starter
|
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
Going to take it to a guy in town with a great dyno. I'll tell him about this.
Trending Topics
Moderator
Joined: Jun 2003
Posts: 3,547
Likes: 71
From: Calhoun GA
Dyno tuning is good as long as the person doing it is able to use the software. I personally don't recommend mail order tunes, especially for power adder applications.
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
Posting Guru
Joined: Apr 2011
Posts: 1,119
Likes: 1
From: Hartland, WI
If anything, having no vacuum to the FPR will cause a rich condition at idle or low throttle, but it won't be the end of the world. Do you have AFPR installed and set to what works best for your tune and injectors? Pulse width is the main controlling factor in how much fuel gets into the engine anyways.
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
This is exactly my point...less vacuum should increase the fuel pressure. If the volume required is exceeding the fuel pump supply the effective pressure will go down.
Posting Guru
Joined: Feb 2013
Posts: 1,555
Likes: 1
Thread Starter
|
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
If anything, having no vacuum to the FPR will cause a rich condition at idle or low throttle, but it won't be the end of the world. Do you have AFPR installed and set to what works best for your tune and injectors? Pulse width is the main controlling factor in how much fuel gets into the engine anyways.
Thread Starter
|
Posting Guru
Joined: Sep 2008
Posts: 2,379
Likes: 2
If anything, having no vacuum to the FPR will cause a rich condition at idle or low throttle, but it won't be the end of the world. Do you have AFPR installed and set to what works best for your tune and injectors? Pulse width is the main controlling factor in how much fuel gets into the engine anyways.
i ain't rite
Joined: Mar 2005
Posts: 65,448
Likes: 5,518
From: Marlboro Mental Hospital.
Ford Diesel HVAC 4WD Electric Vacuum Pump New | eBay