Fuel Pressure numbers - Towing

[John Berger]

My numbers at the outlet port of the fuel filter canister were as follows:

70 mph - steady 6 psi
55 mph - 7-8 psi
Idle - 9 psi
Hammering it up the Dames Point Bridge -
3 psi running in fourth gear at 3000 rpm. This was as low as I saw. My wife called the numbers as I had to keep my eye on traffic. For those of you who live in the Jacksonville, Florida area, this is a pretty good climb, probably 6-7 % grade. It's the largest bridge of it's kind in the Northern Hemisphere. My inlet sender is bad and I'm waiting for the replacement to come in. Your opinions are appreciated. TIA

John

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1999 Dodge Ram 3500 Quad Cab 2wd; 5 spd; 4:10 LSD rear; Mag-Hytec differential cover; US Gear EGT and Boost gauges. Stewart Warner Fuel Pressure Guage with dual senders. Amsoil foam air filter and synthetics from nose to tail.
Cummins Power, don't leave home without it

 

[Blkdawdg]

Hey John, have you drilled out your banjos yet? I would be willing to wager that your pressures would increase by 2 psi if they were drilled out. Check with "brandon" or "csutton7" to see what the status of the adapters they have coming in so that you can change your lines. Then you shouldn't have any problems at all.

 

[bow hunter]

John, It is worth the time to drill out your banjo bolts, before I drilled them 10psi at idle and 4-5psi WOT now with them drilled I get 14psi ilde and 10psi WOT.

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98. 5 SLT Q/C L/B intense blue loaded 3. 54 5 speed straight exhaust,isspro boost egt dual pillar, bullydog stage II injectors NRA MEMBER

 

[FMcClaren]

Hi guys
Do you guys leave your fuel pressure
gauges installed all the time? or just when your testing. I read some were that you shouldn,t. Just wondering.
Mac B

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01 2500 Bright silver QC A/T 4x4 LB 3. 54 50 gal. tank tool box combo. Autometer gauges. Full length DC boards. DC flip out towing mirrors. chrome exhaust tip, front bumper S/S inserts. Reese 5th wheel hitch. 25 ft. Joyco eagle 5th wheel.

 

[Mopar-muscle]

john that pressure is fine , new testing will be done in the next few days with a FLOW meter , not being a fluid dynamics engineer and getting caught up in the MORE IS BETTER philosphy i was taught a new to new way of looking at fuel pressure , psi is created by a restriction to flow .

as long as it ain't pulling a vaccum you have fuel , the excess is going back to the tank , if you have to much resistance to flow , ie: higher pressure , you will be taxing the the pump and heating the fuel up while its trying to figure out where to go , we are looking at increasing the wrong line in size .


the stock system as designed by DC for a stock engine is perfect , except for pump placement , and thats done because the pump is to loud when its running to be under your butt .

 

[John Berger]

No, I haven't. I need to get on that bandwagon. I've been swamped with lot of projects lately. That one fell by the wayside. I'll contact those guys after I talk to Mopar-muscle. I committed to getting his and then kind of dropped the ball #ad