So i am in the market to add a fuel system. In the walboro 392 is it better to get the comp or performance?? I thought if getting just the performance you could switch over to the stock pump with a valve if the truck ran out of fuel at 1/4 tank on the aftermarket setup... or should I get the comp? Help me decide here... Dont want to get stranded though with a 1/4 tank in the truck still

 

Here's a suggestion-

Get the Comp, and fill up at 1/4 tank! It's no different than you filling at "E" but just a bit sooner.

If you do the fuel tank vent mod, you theoretically get your capacity back.

 

tank vent fixes the 1/4 tank prob??

 

Keep an eye on this thread for possible solution -
https://www.dieseltruckresource.com/...d.php?t=181220

 

No, the vent mod just allows you to put more fuel in offsetting the 1/4 tank problem.

I have the performance gfs 392 kit and really like it. I can go below 1/4 tank before having problems. I have to get around 1/8 tank or lower before mine dies. I've only had it happen once though.

Personally I've always filled up by 1/4 tank anyway.

 

I can get 35-38 gallons in at a little below 1/4, but my pump is on a hill that leans my truck to the passenger side so that probably helps me get a little better fill

 

I have run my truck below 1/8 already and only had problems with hard stopping and hard turns at that point. On my standpipe, I cut 2 "V" shaped notches about 3/8 inch deep from the end of the tube. I used 5/8 line to try and help with the flow. I think it depends on the installation of the pick up tube on how low you can go. Someone here made a sump on the bottom of his tank to get every drop, but I dont know how he made out with it.

I just remember to fill up before a 1/2 tank. Anything less than that, I have to call the bank to get a loan to fill it up anyway

 

I just dont want to regret swapping my fuel system and I also dont want to not have to not be able to support my truck having power mods and get stranded because I didnt swap my system..

 

I'd get the perfromance system and wire a switch that allows you to go between stock and 392....talked to richard at GDP...he says this is easy to do, but only on the perf system, not the comp system (dont remember what the diff was)....

Do a good job on the pick up tube and you should be ok to 1/8th of a tank....and if you ever need to use the 1/8 or below fuel....switch her to stock....

This is my plan at least....except i'm going to use the fuel boss when $'s allow....good luck with the decision

 

how close to the bottom of the tank can you make the pick up tube without problems and to get the most fuel range...

 

If you want to avoid the 1/4 tank problem when you do the pickup tube leave the tank installed and lift the bed. It is very easy to do. I did it by myself with two come-a-longs, one would work or have a couple of buddies help. The bed is not that heavy, I picked up one side by myself just to see. You could even just block the front up high enough.
The problem with removing the tank is that it changes shape when you take it out. If you cut the tube to the correct length while it is sitting on the ground or on a jack the bottom is pushed up. When you reinstall the tank the bottom of the tank will drop back down and your tube will be too short. My buddy just did his FASS, he dropped the tank and when removed the tranny jack he watched the bottom of the tank drop down about 1" and he know has the 1/4 problem.
I know I have posted this a few times but just trying to help you avoid the problem.

 

When I installed my pickup tube I cut the v notch and kinda sprang the tube so that it was as close to the center of the tank as possible. I put it directly behind the canister of the stock system. The pickup location and the v notch do apparently make a lot of difference.

I do wish someone would come up with a way to make a sump in there or something. If those big fuel tank manufacturers made a tank with a sump like that I'd jump in.

Treadway,

I did the GFS 392 performance system so I could keep the stock pump just in case. Even with the downfalls of this and all systems at this time I haven't regretted it once.

The perf system was my second mod, right behind gauges. With the only mechanical change being the glacier pump I noticed an immediate smoother idle a little better response and probably a small power increase.

If Richard comes up with a good fix for the below 1/4 tank problem in the future I'll certainly get it even though Id have to get the tank down again.... and I'd hate to have to go through that again!



One idea I have had that maybe some others could run with would be a simple baffle system that could be inserted into the tank.

My mind pictures something that would be plastic and have to be built in the tank. The stock fuel pump pickup would "lock" into a bedplate on the baffles system to keep it from floating and sloshing around. The bedplate would then attach to baffles extending maybe an inch or so high across the tank on either side of the stock fuel pickup.

Then put the new fuel system pickup inside the baffles area. Hopefully it would contain enough fuel to keep the lift pump supplied.

Another variation I have thought about is a foldable stiff rubber baffles insert that would be rolled up and inserted into the tank with the stock fuel pickup holding it in place.

Hey its a thought. If anyone can run with this idea please do so.

 

thanks for the replies... if having the fuel tank out and then blocking it up on the ends should also keep the spot of pick up tube from smashing inward... anyone have any drawings or pics of the v notch.. im mentally picturing several different ways that could be done...

 

id like info on how the switch and valve assembly is done to keep stock lift pump for back up..... any info or links please send me to it or it to me.. Thank all of you so much!! my 02 I had a fass 150 gph installed at EEP but i just did that because some older guys i know ran them and said they worked good.. now i am older and am learning more and more about diesel mods each day and also get leary of things easier now after all the horror and problem stories... lol

 

Treadway,

Check this out for the v notch. Excellent reading here on just how most aftermarket fuel systems work too.

http://www.glacierdieselpower.com/im...rf-Install.pdf