Compressed Natural Gas fuel filter help please

[ron dennis]

I took my 97 f-250 5.4 liter to ford due to hard start and rough funning condition. They told me the #5 fuel injector was bad and that my fuel filter needs to be changed (they feel this clogged the injector). When you use cng the copressors need lubrication and that contamination (at least to a cng system) needs to be removed via the fuel filter. I went to Alldata which is at my local library but I found no information on how to change out this type of cartridge filter. I only found a way to bleed off the pressure under the hood which has already been decreased from 3000 psi to a much lower pressure of around 100 psi + or - Does anyone know how to cut off the pressure on the 3000 psi/ inlet side of the fuel filter....even ford had no exploded view of the filter housing. Any help would be appreciated, thanks ahead of time. Ron

[Randy B]

Originally Posted by ron dennis

I took my 97 f-250 5.4 liter to ford due to hard start and rough funning condition. They told me the #5 fuel injector was bad and that my fuel filter needs to be changed (they feel this clogged the injector).

When you use cng the copressors need lubrication and that contamination (at least to a cng system) needs to be removed via the fuel filter.

I went to Alldata which is at my local library but I found no information on how to change out this type of cartridge filter. I only found a way to bleed off the pressure under the hood which has already been decreased from 3000 psi to a much lower pressure of around 100 psi + or -

Does anyone know how to cut off the pressure on the 3000 psi/ inlet side of the fuel filter....even ford had no exploded view of the filter housing.

Any help would be appreciated, thanks ahead of time.

Ron

I believe you are in the wrong forum. This is for 2007 Expeditions.

Randy B

[Racerguy]

Welcome to the forum Ron

I've moved your question to a more appropriate place for you.

I assume you have a factory CNG conversion?
These don't use a serviceable filter. They use a coalescer/filter assembly that has a drain plug on the bottom. It's on the frame rail roughly under the driver's seat.
The CNG fuel system shouldn't have caused a plugged injector. The CNG doesn't actually go through the fuel injector. The CNG enters the engine through a sleeve that's around the injector.
Most likely it was plugged due to not being used because the truck is run mainly on CNG. Most of the CNG or LPG trucks I've seen with bad injectors just needed an injector flush. It probably would be a good idea to replace the gasoline filter too.

[tszukala]

Is the o-ring on the drain plug for the coalescer made of a special material? Should it be purchased from Ford or will any 0-ring of the correct size work? I don't know the properties of propane and if it's corrosive to certain 0-rings.

[gasman6674]

The O-ring Should be Buna-N.

[vaughnr007]

Jim England
Do you know where we can find replacement Coalesant filters for the Ford PUs? I hate to buy them from the Ford dealer!
RV

[tszukala]

It took me a while to track down the distributor in the US but I finally did and they provided me with filters for $65 + shipping versus $490 from a Ford dealer.

The distributor is:
BAF Technologies
2415 Beatrice St.
Dallas, Texas 75208
214-231-1450

I have a 2001 F-150 5.4L stock Propane bi-fuel and the part # is A3-514 (GFI LPG Fuel Filter)

[jackpatel67]

I have a Ford 250 CNG dedicated and i took it to the ford dealer to change the feul filter. They told me I have oil in the feul filter and the tank. They said i have to flush the tank and change the injector and feul filter. What should i do??