1985 6.2 Motor surges when running, unsure what it could be

[nycxjeremyy]

My 6.2 has been surging as of late, it's acts as if the throttle on it is pushing down on it when that's not the case, ill link a video to this below

https://www.reddit.com/r/Diesel/s/mnAKs16OJR

I've been told it's the injector pump, air in the lines, etc but I don't know anymore, it's driving me insane, and it's causing the vehicle to shake violently when in drive



Any suggestions would really go a long way, thank you

 

[ak diesel driver]

air

 

[Will L.]

Fuel-line.com for the ideal clear fuel line. Otherwise any hardware store sells clear tubing by the foot. One foot is way more than enough. 1/4” diameter. Replace the line that comes out the front it the ip in an upside down “U” shape. I suggest getting two screw style hose clamps because the clear hose is thicker than the rubber.

Having a trapped bubble in it is normal. Having a trail of bubbles is not good- that shows that somewhere in the system is a leak- but instead of leaking diesel fuel out the system sucks in air. Super common.
I agree with the above- you most likely have an air intrusion.

Something else to deal with is getting a fuel pressure gauge permanently mounted on the dash. You want to add the T and sending unit in a metal fitting right at the ip inlet. If your db2 is stock, it will be a 5/16” npt thread. A semi frequent upgrade is to drill and tap it out to 3/8” or just buy the cone for a Ford db2 (Ford got it right). But having the pressure gauge is far more critical than the size of the line feeding until you add a large turbo and bump the fuel screw & injectors.
Target is 4-5psi. Nothing over 8psi.

Fill out your signature line with truck details, any modifications, etc. it will help. Lot in diagnostics and suggestions of things that can help you based on your goals.