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I finally figured out where the FWS should be and it's not there. I'd like to put one back in the truck but I'm still trying to figure out how the fuel system is routed on this thing.
Can I put a FWS on the frame after the inline electric pump? The factory location looks like a PITA and it's already bypassed anyway so the fuel lines aren't there.
I'm thinking both tanks to the selector valve...then to a prepump filter...then to the pump...then to a fuel water separator...all inside the frame rail near the midship tank.
Anyone done this? Tips and/or part numbers would be awesome.
I finally figured out where the FWS should be and it's not there. I'd like to put one back in the truck but I'm still trying to figure out how the fuel system is routed on this thing.
Can I put a FWS on the frame after the inline electric pump? The factory location looks like a PITA and it's already bypassed anyway so the fuel lines aren't there.
I'm thinking both tanks to the selector valve...then to a prepump filter...then to the pump...then to a fuel water separator...all inside the frame rail near the midship tank.
Anyone done this? Tips and/or part numbers would be awesome.
Thanks!
I think I would rather have one mounted inside the engine compartment on the fender. Warmer, dryer, less dirt. I like changing filters while standing up.
The factory water seperator filter on my 86 was still hanging on the Fire Wall, but the 2 rubber hoses were
connected together in a loop. Follow the fuel line from the FSV towards the engine. It will run up the drivers
side to the filter, then back down and under the engine to the Feed Pump.
I just bet cha the fuel line is still there.
I gave mine the deep 6 and installed the Racor 500FG water seperator filter. It is bolted to a metal plate which is
bolted to the two holes on that metal tab by the drivers side hood hinge.
There is 3 sizes of filter that fit inside the housing, a 2, 10, and a 30 micron element.
You can find these filters on E-Bay fro much cheaper...like $60. But they are a Chicom knock off. I would advise to
stay clear of them.
I actually found mine at PNP on a 85 6.9 4-spd. So I grabbed it with the mounting plate, cleaned it up, ordered a new
gasket kit. Later found a case of the filters, so Iam all set for a long time.
Ford didn't do their research on that particular water separator. It's the same one that worked fine previously on 3208 Cat diesels, but as Charmalu posted, it's incompatible with 6.9/7.3 fuel drainback systems. Best to replace it with a Racor or whatever.
I crawled around under the truck yesterday. My fuel system is pretty messed up. The rear tank is completely disconnected...looks like the rear supply line is plumbed back to the return line and its looped around the steering column and open to atmosphere. There's no selector valve either and I think I'm seeing 5 fuel lines inside the frame rail...PO must have ran new. I also think I need a new radiator and I'm trying to locate a tranny leak...I think it's at a cooler connection.
Anywhere at the fuel filter, transfer pump to IP, including the 6.9 water separator, and drainback O-rings where air can enter results in air entering the fuel system causing hard starting if the engine's not run a day or two. Due to a totally different injection and drainback system on 3208 Cats, that same factory stock water separator could take in air but wouldn't effect cranking time or engine operation at all.
Anywhere at the fuel filter, transfer pump to IP, including the 6.9 water separator, and drainback O-rings where air can enter results in air entering the fuel system causing hard starting if the engine's not run a day or two. Due to a totally different injection and drainback system on 3208 Cats, that same factory stock water separator could take in air but wouldn't effect cranking time or engine operation at all.
OK. Thanks.
What is it that makes the Cat system OK with air intrusion?
Different design completely, same with the big Cummins, and 2 cycle Detroits, you could undo the drainback hoses, let the fuel run on the ground and the engines wouldn't miss a beat--there's no air intrusion on the fuel inlet side to the IP. IDI fuel systems, when they have a drainback air leak, it siphons or allows fuel from the inlet side of the plumbing partly back to the tank and lines going to the IP get air-locked .
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