99 Massive Oil Consumption
Elder User
Joined: Nov 2012
Posts: 642
Likes: 0
From: Onlsow, NC
being an early 99, maybe. I'm not too up on the fuel system, but my understanding is it wasn't until late 99 that ford implemented the "dead head" fuel rail system where the fuel doesn't return to the tank.
Lead Driver
Joined: Jun 2004
Posts: 6,325
Likes: 585
From: Amarillo, TEXAS!
Fuel does return to the tank from the fuel bowl. It isn't supposed to come back out of the heads since there are check valves at the fittings. If a check valve is bad, oil/fuel mix could be forced back to the fuel bowl then return to the tank. If that's happening, the water coalescing screen in the fuel filter should turn from white to black.
Elder User
Joined: Nov 2012
Posts: 642
Likes: 0
From: Onlsow, NC
Fuel does return to the tank from the fuel bowl. It isn't supposed to come back out of the heads since there are check valves at the fittings. If a check valve is bad, oil/fuel mix could be forced back to the fuel bowl then return to the tank. If that's happening, the water coalescing screen in the fuel filter should turn from white to black.
Elder User
Joined: Nov 2012
Posts: 642
Likes: 0
From: Onlsow, NC
I thought early 99 had a return? Or was the return line directly to the tank and there was a check ball coming from the fuel bowl?
I'm always learning something new in this forum.
I'm always learning something new in this forum.
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Lead Driver
Joined: Jun 2004
Posts: 6,325
Likes: 585
From: Amarillo, TEXAS!
The fuel pump feeds the filter housing, which feeds the heads through a check valve on the front of the left head and read of the right head. There's a return pressure regulator on the return line from the filter housing, but no return directly from the heads to the tank. The only way out of the heads is supposed to be through the injector nozzles.
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
It has been quite a while since I checked it but I thought all those fittings on the fuel line going into the heads were little wire screens. Like a little filter. For fun I would defiantly pull the fuel filter!
Senior User
Joined: Sep 2011
Posts: 428
Likes: 0
what mods did you do to run black diesel and how much are you thinning it out
Senior User
Joined: Aug 2007
Posts: 412
Likes: 0
From: Fresno, CA
A 5 micron prefilter was the only mod on the truck. Water injection was added to reduce the smoke that would eventually show up. I thinned it 15-20% with gas and filtered to 1 micron. I don't run it anymore due to the time it took to collect and filter it.
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