Fuel pressure regulator
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Let me try explain in writing (kinda tough more of a hands on). First what the other guys are talking about is dead head pressure. To truley test your fuel system's effeciency and diagnostics you take your pressure readings at the returns. The only way I can think of putting in writing is your testing residual pressure. Another words the pressure after the pump got what it needed.
If you have the 2 psi at the return going to the tank at the back of the motor, than you know you have enough pressure for the Injection pump. If you were over 2 than you may have a restriction. This method is alot like flow test of 1 pint in 30 seconds of cranking.
This is a more technical method and you can learn alot about your fuel system instead of just throwing parts at it poking and hoping.
If you have the 2 psi at the return going to the tank at the back of the motor, than you know you have enough pressure for the Injection pump. If you were over 2 than you may have a restriction. This method is alot like flow test of 1 pint in 30 seconds of cranking.
This is a more technical method and you can learn alot about your fuel system instead of just throwing parts at it poking and hoping.
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
That is why I am wandering where you got that chart as I am not familar with a 6,6 or a7.8 ford.
They will run on low pressure because when my mechanical pump started pumping fuel in my oil I installed a small generic electric pump (One that I had) I have no idea what pressure it put out but it was low. This was in a 76 highboy and I had the seat tank in the cab, coming back from arizona one time the electric pump went out and it would still run and pretty good too down to about 3/4 of a tank. I was running empty not pulling a load but it got me home without a pump.
They will run on low pressure because when my mechanical pump started pumping fuel in my oil I installed a small generic electric pump (One that I had) I have no idea what pressure it put out but it was low. This was in a 76 highboy and I had the seat tank in the cab, coming back from arizona one time the electric pump went out and it would still run and pretty good too down to about 3/4 of a tank. I was running empty not pulling a load but it got me home without a pump.
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Senior User
Joined: Feb 2009
Posts: 372
Likes: 0
From: Westfield, MA
Ok that makes sense. So if I had a quage in the line going to the filter with the engine running and everything working as it should it would read 2 psi. So back to my original question, what is the psi that the mechanical pump puts out? Do I need to worry about regulating down the fuel pressure coming from my electric pump?
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Senior User
Joined: Feb 2009
Posts: 372
Likes: 0
From: Westfield, MA
Well I just looked up the specs on my electric pump. It is a Carter rotary vane positive displacement pump. I puts out 4-6 psi and 73 gph. It says that it does not need a regulator unless 6 psi is more then what the vehicle can handle. Looks like I will be fine without a regulator.
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Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Your forgetting the engine is eating the pressurized fuel. You naturally going to have pressure drops just from laws of hydraulics. A whole nother lesson and my fingers hurt.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Well I just looked up the specs on my electric pump. It is a Carter rotary vane positive displacement pump. I puts out 4-6 psi and 73 gph. It says that it does not need a regulator unless 6 psi is more then what the vehicle can handle. Looks like I will be fine without a regulator.
4-6 is alot better than your initial report of 10
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Senior User
Joined: Feb 2009
Posts: 372
Likes: 0
From: Westfield, MA
Yeah, I was going off of my very week memory. I had looked at so many pumps before finally getting the Carter all the numbers started running together, thats why I went out to look at the pump and looked it up on line again. Jegs carries it and has a picture of it but I bought mine at Poorman's Auto.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Yeah, I was going off of my very week memory. I had looked at so many pumps before finally getting the Carter all the numbers started running together, thats why I went out to look at the pump and looked it up on line again. Jegs carries it and has a picture of it but I bought mine at Poorman's Auto.
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Senior User
Joined: Feb 2009
Posts: 372
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From: Westfield, MA
I saw the same one at AutoZone but was scarred away from it because a few people said they had problems with Mr. Gasket pumps. The book at Poorman's on the pump that I bought said that it was good for diesel as well but it was twice the price as the Mr. Gasket pump. I bought my pump over a month ago. If I had posted this before I bought my pump I may have gone with the Mr. Gasket. How long has yours been installed, any problems with it?
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
I saw the same one at AutoZone but was scarred away from it because a few people said they had problems with Mr. Gasket pumps. The book at Poorman's on the pump that I bought said that it was good for diesel as well but it was twice the price as the Mr. Gasket pump. I bought my pump over a month ago. If I had posted this before I bought my pump I may have gone with the Mr. Gasket. How long has yours been installed, any problems with it?
You have an advantage having an A/P lic or atleast being around aircraft you may tend to think things out a little more.
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Senior User
Joined: Feb 2009
Posts: 372
Likes: 0
From: Westfield, MA
I am running the pump through a relay. The trigger side of the relay is getting power from the fuel shut off solenoid on the IP. The power side for the pump is coming off the starter solenoid that is always hot and I installed a weather proof, in-line, blade style, 10 amp fuse holder to protect the pump. I'm using 14 ga. wire for the trigger and 10 ga. wire for the pump. Almost all the connectors are weather proof. The 10 ga. wire is over kill but thats what I had laying around. When I am completely finished I will try and see if I can figure out how to post some pictures.
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