In-Tank Mod Question
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
In-Tank Mod Question
I am going to work on doing the in-tank mods shortly. I have a buddy that works at Walbro (not TI Auto) and he can get me any type of fuel pump for free. I am just wondering what type and pressure regulations I should keep it in? I know I can put a regulator on it but I just want to make sure when I do it I am not going to over fuel or under fuel it. What is your guy's suggestions for fuel pressure?
Posting Guru
Joined: Sep 2007
Posts: 2,121
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From: Knoxville, TN
The in-tank mods won't mess with your fuel pressure. As long as you don't mess with the fpr on the fuel bowl, then your pressure will stay the same. You will want to get a pump like this.......http://cgi.ebay.com/ebaymotors/WALBR...Q5fAccessories
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
I am going to work on doing the in-tank mods shortly. I have a buddy that works at Walbro (not TI Auto) and he can get me any type of fuel pump for free. I am just wondering what type and pressure regulations I should keep it in? I know I can put a regulator on it but I just want to make sure when I do it I am not going to over fuel or under fuel it. What is your guy's suggestions for fuel pressure?
If you can, go ahead and get the 5.4 intank set up for a 38 gallon tank. Then all you should have to do in remove the mixing valve, Run electric to the new pump, and extend your return line. You can remove the existing pump right out of the system.
https://www.ford-trucks.com/forums/8...-question.html
Post Three and post Seven is what I am basing this off of.
Posting Guru
Joined: Sep 2007
Posts: 2,121
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From: Knoxville, TN
Me too, are you installing a regulated return or just doing the in-tank mods?
Thread Starter
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
I want to do the in-tank mods and use the Walbro lift pump. Upgrade the supply line but use the stock return line.
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Go Bills !
Joined: Jan 2008
Posts: 2,778
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From: Buffalo, NY
My factory Pressure was 55psi. I shimmed the FPR to 75psi. And drove on that for a while. Recently i brought it down to 65psi. I run the CCK so it is the cheap version of the regulated return. (i played with pressure to try to get rid of my idle knock and was easly enough to try)
What is wrong with your factory pump? If you can get a new similiar pump, that is awsome. Toss in box for a spair. Maybe grab another free pump and send to your friend Danskool so he has a spair for when he travels.
What is wrong with your factory pump? If you can get a new similiar pump, that is awsome. Toss in box for a spair. Maybe grab another free pump and send to your friend Danskool so he has a spair for when he travels.
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
After talking to my buddy, he told me that it really isn't worth going to 1/2" unless I was turning 700 horsepower so I think I am going to stay with 3/8". I also have access to the Parker Push Lok hose so I might as well use that too but I just need to know what to set the regulator too when I do it.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Your buddy is right, and saved you a munch of trouble. 
You want to run about 65psi at the bowl at idle. It would be best if you can monitor your pressure while you're driving too. A few of us do that by putting a mechanical fuel pressure gauge outside the cab:
You want to run about 65psi at the bowl at idle. It would be best if you can monitor your pressure while you're driving too. A few of us do that by putting a mechanical fuel pressure gauge outside the cab:
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
If he's just putting in a lift pump and leaving the stocker alone (too much trouble for any gains, IMHO) then no regulator is needed. If he's replacing the stock pump with an in-tank version, then probably. The fuel bowl has the FPR, so I would think that as long as the replacement is close to stock specs, it could be adjusted for the optimum pressure. It's MUCH easier to just replace that and go with a reg return though. I'm about to put mine on to support the injectors. 
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
The FPR *IS* the regulator. I just don't know how much adjustment you'd need to make it right with the pump you're looking at. Are you replacing the one on the frame for one in the tank, or just going with a lift pump in the tank?
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Laughing Gas
Joined: Sep 2007
Posts: 1,051
Likes: 4
From: Caro, MI
Our fuel pump is not in the tank? I thought it was but if it is on the frame, then I might just shim the FPR to get more psi. I for sure want to do the in-tank mods to help eliminate airation.