8V71 Fuel Filter Change

chessie4905 · June 28, 2018, 07:19:46 PM

If you experience filter plugging on the trip, just replace primary one, as it may take care of it since it'll get all the crud. Since your coach may have set for awhile before you owned it, there may be crud in tank that is now going to be stirred up on that trip. Make sure to have a jug of clean fuel along, nitrile gloves, and a couple of rolls of paper towels and a few large zip lock bags to hold old filter and soiled towels. Don't forget the orange hand cleaner.

luvrbus · June 29, 2018, 07:44:22 AM

LOL fuel filters are old technology,fuel processors are thing now 1 filter go to a wrecking yard and buy a Davco 380 from a truck for 50 bucks then you solve the priming problem too

.Only way to go now just look at the bowl and see if the filter needs changing

chessie4905 · June 29, 2018, 11:18:28 AM

I prefer the spin ons. Those fancy things eventually go away and you can't get parts or spendy. Maybe good for the new electronic engines though.

DoubleEagle · June 29, 2018, 03:15:34 PM

Quote from: chessie4905 on June 29, 2018, 11:18:28 AM
I prefer the spin ons. Those fancy things eventually go away and you can't get parts or spendy. Maybe good for the new electronic engines though.

The fuel processors are good for all engines, and the filter element is cheaper than the spin-on's. This is one improvement that is worthwhile and will last. I put one on my 8V71 after I saw it at a bus convention in Las Vegas in the late nineties, it is still performing nicely. As Cliff said, it ends priming problems. You just open up the top cap and pour some fuel in. I don't care for electronic engines, but I like the fuel processors.

richard5933 · June 29, 2018, 03:23:50 PM

Would there still be need for primary & secondary? If not, then does the new fuel processor go in place of the primary?

Paso One · June 29, 2018, 03:47:55 PM

On my 6V92 in a GM I took off both primary and secondary filters. and just used the 382 processor. Love it take a look and you know wether the filter needs changing.

On a 8V71 in a MCI I had to keep the secondary spin on filter OR buy the diverter valve that Davco sells.
The reason on the MCI for keeping secondary is they have two fuel lines one going to each head.

DoubleEagle · June 29, 2018, 07:26:22 PM

On my Eagle, the processor replaced both spin-on's.

luvrbus · June 29, 2018, 07:37:17 PM

For engines with dual line feed you just remove the feed line from 1 head and tie the 2 heads together it's not a big deal

chessie4905 · June 29, 2018, 07:50:52 PM

Get spin on tops with removeable plug. Screw on filters, remove plugs and fill with fuel. Replace plugs. You can also install a pressure sensor to trigger a dash light when filter starts plugging. The Flxible city bus had this setup.

Paso One · June 30, 2018, 07:32:33 AM

Quote from: luvrbus on June 29, 2018, 07:37:17 PM
For engines with dual line feed you just remove the feed line from 1 head and tie the 2 heads together it's not a big deal

Hi Cliff can you elaborate on your method , a simple tee ? placement?

luvrbus · June 30, 2018, 07:48:06 AM

I just use the 1 feed on the passengers side the cross over hose is there for the return anyways so I use it and leave the return on the drivers side they don't care about where they get the feed from then I plug the filter for the other supply line.I really don't know why MCI did that ? your return come out the rear of the head or front,if from the rear then plug the front