ok i just got a chance to blow out the draw straw on the tank. blew it out 8-10 times just to be sure with short quick burst of air. also blew out the line from the tank to airdog. started the truck and it slowly made its was to 60 psi and was struggling to stay there. i taped the throttle and it shot right back down to 50 psi and stayed there. going to get a volt meter here in a few mins and check that. no one in town (auto parts stores) has what i need to check the suction. but if you watched the fuel pressure gauge and listened to the airdog you could see the needle having a slight bounce and the airdog didnt sound steady. it acts like it wants to get up there but just cant. any other suggestions? ill report back on the volts here in about an hour as long as i dont forget to get one while im in town.

 

ok its getting 12.4 volt to it so the electrial is fine!

 

I got your sticker

 

haha did you really?

 

Yupp, I went to xdp on Saturday ( 2 1/2) hr drive for me.

I got there and picked out my tuner and some other things and they tell me

" on Saturday's our warehouse is not opened so we cannot sell anything"


So 6 hours of my day and $100 in fuel wasted I got a few free stickers.

If you want it let me know. I'll send it to you for nothing. Lol
Sorry

 

Here is my AD2 setup. My setup is a "dead end" setup. In other words no fuel return from the OEM pressure regulator. The return is from the AD2 to the tank.

I used the OEM fuel line from the tank to the AD2. That was my only non compliance with the install instructions. The instructions said install the 1/2 inch fuel line from the tank to the AD2. To me that makes no sense if you do not upgrade the fuel pick to 1/2" also. Anyway, I also removed the OEM fuel filter on the engine. That includes the filter stem. No sense in having another restriction in the supply line since the AD2 filter is as good as the OEM. I plugged the OEM return line from the filter back to the tank. If you have the adjustable presure regulator AD2 you MUST plug the OEM return line or your fuel pressure will never get above 45 psi.

Now for fuel pressure. My AD2 internal pressure regulator is set to 70 psi at idle. I have a pilar mounted fuel pressure gauge to always monitor my pressure. When I start in the morning my fuel pressure is only 50 psi. That is because the glow plugs are on and produce an electrical system voltage drop. As soon as the glow plug cycle completes, my fuel pressure instantaneously goes to 70 psi at idle. During normal driving my fuel pressure is 65 to 70 psi. When I crowd it, the pressure will drop to 60 psi.

I also have modded the banjo bolts. I have removed the check valves and drilled all 3 holes out to .200". That improved throttle response and power, significantly, but dropped my mileage by 3.5 MPG with my SCT "street" tune installed. As we all know performance vs. mileage is always a trade off. Now Eric from ITP reworked my "economy" tune and I now have that installed. Don't have any MPG figures yet but will have them by the weekend.

DSMMH

 

see i have a regulated return so i cant plug the return fuel line. also i had great pressure up until one day and then all of a sudden it just dropped like a rock.

 

does your air dog have a regulator or return of any kind? if so crank it to the max and use the regulated return to set your line pressure

 

yea it has a regulator. i have the airdog turned all the way up and the regulated return shut off right now just to get fuel to the thing because that is my initial plan is to use the regulated return to adjust the pressure

 

I have a 86 f150 I got it not to long ago it’s only got 37k on it so I have hope in it. But I can get it to start then it just dies after a couple seconds I have 50+ pounds of fuel at the rail my fuel is on another circut due to the pumps just up and quitting one day I replaced the relay but it didn’t do any good so the pumps are hot when the key is on. Any ideas? I can hear both pumps run when key is on, but when I go to “start” position the go off probably because there on a fuse. Any ideas why it just shuts off?

 

There hasn't been any activity in this thread in over ten years, and the original poster hasn't logged into ford-trucks.com in almost nine years. Also this is the "6.0L Power Stroke Diesel" forum, which I'm guessing your 1986 F-150 does not have. I believe you'll have better luck if you start a new thread for this issue over in the "1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks" forum. You'll find it in the "Older, Classic & Antique Trucks" section of the main forums page. Once you do that, I bet you'll get some answers quickly. With only 37,000 miles on it, I suspect the fix won't be too difficult. Also, while you're starting the new thread over in the "1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks" forum, be sure to include the basics like:

- Engine type and size
- Transmission type
- Any recent repairs or maintenance
- Etc.

That will speed up the responses.