Twan
Member
Guess will see soon, but i got my money on you still having 100 psi. The fact is you can not regulate what is in front (feeding) the regulator. My offer still stands for the tester too.
100+ PSI fuel pressure
- Thread starter FX4 F2-Fifty
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IdahoF350
New member
Twan, try and wrap your head around the following simplified explanation. Don't over think it.
The regulator is simply a variable restriction. You can set the regulator for 0psi all the way to 100psi, and all you are doing is changing the flow rate of the restriction. It doesn't matter what pressure you set it at, the entire system from the pump to the regulator will operate at the regulated pressure. After the regulator, you have free flow and thus little to no pressure.
UNLESS there is a fixed restriction in this system before the fuel is getting to the regulator. This is a HUGE pump relative to the demands of the engine. Even at WOT high load, the OP is seeing the 100psi. before the heads. That means there is a restriction greater than the restriction created by the regulator somewhere between his fuel block (forward point of measurement) and the regulator (final point of measure).
It's more like water from a garden hose than air from an air compressor. The air compressor regulator regulates what comes off the tank down to a set pressure. But a water hose, you turn the valve on full blast with a spray nozzle and the spray nozzle regulates the full flow. In this case, it's like the valve is only slightly open, so all the pressure is behind the valve (restriction) and your spray nozzle only gets a trickle of water.
The regulator is simply a variable restriction. You can set the regulator for 0psi all the way to 100psi, and all you are doing is changing the flow rate of the restriction. It doesn't matter what pressure you set it at, the entire system from the pump to the regulator will operate at the regulated pressure. After the regulator, you have free flow and thus little to no pressure.
UNLESS there is a fixed restriction in this system before the fuel is getting to the regulator. This is a HUGE pump relative to the demands of the engine. Even at WOT high load, the OP is seeing the 100psi. before the heads. That means there is a restriction greater than the restriction created by the regulator somewhere between his fuel block (forward point of measurement) and the regulator (final point of measure).
It's more like water from a garden hose than air from an air compressor. The air compressor regulator regulates what comes off the tank down to a set pressure. But a water hose, you turn the valve on full blast with a spray nozzle and the spray nozzle regulates the full flow. In this case, it's like the valve is only slightly open, so all the pressure is behind the valve (restriction) and your spray nozzle only gets a trickle of water.
SICKS LITER
New member
a garden hose is a good comparison to an A1000, those pumps flow alot of fuel.
Twan
Member
A reg is just a restriction right?
So wouldn't he be losing pressure if he a restriction?
My brain will not let me understand it, I will be building a full kit on our show car, 71 Camaro, not sure how soon, but that will help me understand. It will have a return.
Thanks for trying to help.
So wouldn't he be losing pressure if he a restriction?
My brain will not let me understand it, I will be building a full kit on our show car, 71 Camaro, not sure how soon, but that will help me understand. It will have a return.
Thanks for trying to help.
alwil
Member
you type faster than I can delete I guess lol.
SICKS LITER
New member
there is pressure lost after the restriction because of the loss of volume and velocity.
the regulator is used to restrict the flow of fuel, this creates pressure before it.
Twan
Member
After talking with Matt, he help me understand. I now see what is going on, I have never seen this type of reg before. So sorry for the misunderstanding.
FX4 F2-Fifty
New member
:thumbup: No problem, i knew what you were getting at, but its a lot easier to see whats going on when its in front of you.
The plan so far is when i have the up-pipes out(hopefully this week) i will remove the banjos and hardlines, make sure there is nothing funny going on, possibly drill out the banjos a little and reassemble. If this does not fix it then i will order some 90 fittings and lines for the rear or the heads and install them when i have the transmission out.
I too am curious as to why a manufacturer has not commented on this? Someone has taken readings before the heads? There are hundreds(maybe more) of people running setups almost identical to mine.
mgeistman
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That's why I used a regulated pump
mgeistman
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That's why I used a regulated pump, a1000's will move some fuel!!
2006.1f250
New member
I'll give it a test on my Excursion when I get home Saturday. I'm curious to see what it is after all this banter.
alwil
Member
How did this turn out
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FX4 F2-Fifty
New member
Haven't dug into it yet. Waiting on parts to get here so I only have to pull it apart once. I was hoping someone else would chime in with readings before the heads.
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2006.1f250
New member
I hoping to gather the fittings and gauges for this tomorrow. Just got home from a 5 week hitch, but I'll get it done tommorow.
2006.1f250
New member
Sorry for the delay, but I was finally able to get this done. Stuarts only had one 100 psi gauge, so I had to use one 60 psi gauge. First video is key on only. Second and third videos are idling. In the second video I dropped the pressure to 50 psi. In the third video, I went ahead a raised the pressure to 60 psi again. Looks to be an 8 or 9 psi difference.
http://rides.webshots.com/video/3096812250104019584JvnatT
http://rides.webshots.com/video/3096812250104019584JvnatT
http://rides.webshots.com/video/3018146150104019584BBJOWF
I tried embedding them, but it wasn't working for me.
http://rides.webshots.com/video/3096812250104019584JvnatT
http://rides.webshots.com/video/3096812250104019584JvnatT
http://rides.webshots.com/video/3018146150104019584BBJOWF
I tried embedding them, but it wasn't working for me.
hawgdoctor
Active member
That sounds more like what you should be seeing. To the op, it seems that the stock banjo's are your restriction. We use high flow banjo's in our set-ups, and they will out flow the stockers by about three fold. Also what size are your hard lines off the back of the heads? We use 5/16 (as does everyone else) so that should be your minimum, and from there it's all -6 teflon line. Hope this helps.
FX4 F2-Fifty
New member
THANK YOU :bowfast::bowfast::bowfast:
Thats exactly what i wanted to know. Do you mind sharing your setup? Pump, reg, etc.
I should be stripping mine down here in the next couple of days. Still waiting on parts for the mini tear down. My money is on the banjos and hardlines on the rear of the motor. if i can get mine down to ~20psi difference i will be happy.
2006.1f250
New member
Its Elites stage 2 fuel system.
FX4 F2-Fifty
New member
So you have hardlines and banjos in the rear of the heads? Then the stainless braided lines connect to the hardlines above the rear of the motor then to the regulator?
