fuel problems

[dieselfuelonly]

i have an 86 6.9 and it has ran great for me
today it started idling rough and when i drive it would be a dog and then crank way up then it would idle fine and then go back to choppy idle i think it may be the fuel pump and/or the fuel lines and filter
anyone know what if might be

[RCPro87]

Check that fuel pressure!!

[dieselfuelonly]

how?
i was just gunna put a new fuel line on since the one the previous owner put on is all messed up and since i was gunna do that i was gunna put on a new fuel pump since theyre only
$30

[RCPro87]

IIRC on the 6.9 there is a place to put a fitting in the valley of the motor on the driver side attached to the fuel lines coming into the bowl.

[dieselfuelonly]

shouldnt i just plan on changing the pump since its only $30 and its prolly the original pump

[SCUFFY828]

first rule of any repair is to do proper diagnosis before replacing any part , make sure you have good fuel pressure 5-8 lbs to be exact will run the truck fine , no need to buy parts that arent needed

[Ryan Rønning]

For $30 if its was the original I would replace it anyway!

[SCUFFY828]

Originally Posted by RRonning1984

For $30 if its was the original I would replace it anyway!

why replace a part there may be nothing wrong with , 30 dollars is 30 dollars

[RCPro87]

doesnt the 6.9 have a fuel bowl similar to the 7.3? same basic setup right?

[Ryan Rønning]

Originally Posted by SCUFFY828

why replace a part there may be nothing wrong with , 30 dollars is 30 dollars

I know but I just tend to replace stuff when it is really old or has a lot of miles on it. Too many times of being stranded because something suddenly and inexplicably broke or gave out!