86 F350 6.9 Fuel Pressure
 

I would like to change from the mechanical pump to a 12volt inline pump on my diesel, but I do not know what the fuel pressure should be. Any Ideas. Also I am doing this to eliminate the diaphram mechanical fuel pump. I plan on converting this truck to run waste vegtable oil(wvo). I have two diesel tanks and will add a WVO tank, so I want to install one pump for Diesel and one pump for WVO. Also I have a GASOLINE version of the same truck with a bad intank fuel pump, and of course its a bomber also, so im also going to put in a inline 12volt pump for gas.


Looking for fuel pressure on 86 f350 diesel 6.9 , Low pressure side.


Looking for fuel pressure on 84 f350 GASOLINE 7.3(?), low pressure side.

for the diesel, get a holley red pump. they work great.

i think its 12 to 15 from the stock pump,


DieselCrawler did you just tie that holley pump in before the mechanical and let er rip or howd you do it?

bypass the mechanical. just plugged it up incase holly goes out i can tie it back in to get home.

and you dont need to run a regulator or anything

nope. sytem will return any extra fuel threw the return lines

You dont want more than 5-7 psi going to the IP, if the pressure is to high it will throw off your timing.