How do you clean an mpi fuel system from old fuel?

[The motor guy]

I drove the old dodge a few times many years ago and it was a banger. Looks good on the outside but the engine was pretty rough.

Larger the engine the smoother it runs? You fire one of 4 cylinders and the other 3 have to absorb that explosion. Firing one cylinder on a 6 or 8 cylinder has more mass to absorb. Just my theory

 

[The motor guy]

Ahhh... a boat, you should have mentioned that.

Limited use things (like boats) like to clog injectors. I'd start with pulling them and having them serviced. I just ran the injectors on my merc 260 outboard and I had 2 that were pretty bad dripping at 390cc/minute while the good ones were at about 490cc with a good spray pattern. I changed the baskets and cycled them in the ultrasonic a bit and got them all to within about 1% of each other at 495cc/min at 40 psi.

If you don't know when it was last done, I'd get the injectors serviced, start there. Change your fuel filter, and see what happens.

I haven't done it yet, but I'm going to plumb in a fitting to run the engine off of an aux. fuel tank and use that canned $20/gallon stuff with a 3 year shelf life from home depot to shut it down when it's gonna sit for more than 3 weeks or so. We have E10 fuel here and it's mostly garbage if you don't use it within a week or so.

I dont get how people have 25 year old cars with 15,000 miles on them that still run great and just sit in the garage all the time

 

[The_Jeff]

You don't use the suffix "-banger" to describe a 6 cylinder vehicle. It's a 6 "pot". Four cylinder cars are termed -bangers because historically they're not as smooth as sixes.

So is it Beemer or Bimmer?

Op needs to siphon his old fuel and burn it in his car at 25% strength until its gone.

 

[The motor guy]

So is it Beemer or Bimmer?

Op needs to siphon his old fuel and burn it in his car at 25% strength until its gone.

The fuel isn't that old though.

 

[The motor guy]

So is it Beemer or Bimmer?

Op needs to siphon his old fuel and burn it in his car at 25% strength until its gone.

Bimmer

 

[The motor guy]

Took the boat out today and she ran great! I gave it a good goosing at the boat ramp up to about 2500rpm a couple times before backing it off the trailer. My theory was that extra load would help unstick the throttle plate if it was stuck or stiff from sitting. Had it up to 4100 rpm once out on the water and not a single stumble. Still has the same fuel in it. Honestly. The fuel isn't that old yet. About 3 months. I just added like 35 gallons to it the last time I went out people. People up north keep fuel on board for like 7 months. Like I said, no rhyme or reason to this stumbling out of the no wake zone

 

[The motor guy]

Doesn't make sense though why it does that bogging thing though. Maybe it sat too long last time and I got lucky and one of the injectors unclogged themselves on their own?