cwd240z

In doing the LS1 swap in my S10 pickup, I got rid of the original 4.3 fuel filter in favor of the 2.2L flex fuel S10 filter (wix 33100) with the built in regulator, which is similar to the Corvette filter (wix 33737).

From what I have researched, 2.2L flex S10's were weird and had 5/16" feed lines and 3/8" return lines, which would lead me to believe that the center connection on the 33100 would be the feed and the offset would be the return (which is the opposite of the 33737 filter, from what I've seen) However, I have also read conflicting information that says the opposite. If only the damn filter was labeled.

I'm trying to prevent running the fuel backwards through the regulator and ruining it. Also, if I have starting issues, I'd like to know that the filter is connected correctly.

Is there anyone using this exact filter, Wix 33100, that can tell me definitely which connection is the feed from the tank and which is the return?

Thanks you guys.

1989GTA

With the fuel injection systems I have worked on the return line from the regulator was the smaller line.

cwd240z

And that way makes sense which is why this is confusing.

ls1nova71

iTrader: (4)

Never seen a 5/16 feed with a 3/8 return, just doesn't sound right. Curious though, why not just use the 33737 Corvette filter that is known to work?

cwd240z

The 33100 filter is a little cheaper and guys have used it on LS S10 swaps with no problems. I've asked at least 2 guys who have used it and have gotten 2 different answers. Obviously, someone is wrong. If I still had my other S10 with it, I'd go outside, disconnect the 2 lines, turn it on and see which one spits fuel out.

Another reason I went with the 33100 filter is it has quick disconnect fittings on all 3 ports, eliminating the need for an additional fitting.

bisqikss

iTrader: (2)

the 5/16 on the side with the 3/8 is where the line from the fuel pump comes in, then out the other 5/16 to the engine. the 3/8 is a return. just went through this on a swap. I also used the 2.2 flex fuel module assembly in the tank. so I know that this combo works. I would ASSUME that with any other pump in the tank that this would work, but I know for sure it worked on my s10 swap.

cwd240z

Alright. I also got a Delphi flex fuel pump for it, but haven't put it in yet.

Just to clarify, the connection that goes to the engine is 3/8" on this filter, not 5/16".

bisqikss

iTrader: (2)

no, use both 5/16's for the feed and the 3/8 is the return for the tank.
the side where you have two nipples(use the 5/16 to connect to the fuel pump in the tank, and the 3/8 for the return line to tank). the single 5/16 goes to the engine.

cwd240z

Right, I'm following you on which is which on the side with two nipples. 5/16" is feed and 3/8" is return.

I was just clarifying that the fitting on the side of the filter with just one fitting, is 3/8". I've connected a 3/8" fitting to it. You can also tell by looking at the picture it is larger than the 5/16" connection on the other end. I updated the picture to show it labeled.

I appreciate your help man.

bczee

iTrader: (12)

I guess it might work as you have been told or read. Though I would question it capacity since it was used on a 2.2L as well as what fuel pressure is it rated at..

What is the return pressure rated at ?..Is the filter element rated to filter to the same Micron ? and at what pressure and flow rate ? This being that you are using something that was designed to work with 2.2L spec's and not going to a 5.3L that requires 58psi ?

Let us know what you find out.. if anything else new..if anything, I would swap it out more.

cwd240z

It has been documented on an S10 forum that the 2.2L flex filter works well with LS1 V8 swaps and has the correct pressure. One member has run an unmodified 2.2L flex fuel system with an LS engine swap up to 400hp. My stock LS1 should be fine with it.

bisqikss

iTrader: (2)

sorry, I meant single 3/8 to engine. I know it sounds weird for it to be that way. I thought so at first, but Have been running this on s10 for about 5 months now, and have not had any issue with fuel at all.

1989GTA

"Though I would question it capacity"

Me too. Especially when you up the horsepower. The Corvette filter can be had for under $40. I would not fool around at that price and go for the Vette filter.

Edit: The factory may have intentionally made the filter that way so it could not accidently be swapped onto another application such as the Corvette.

ls1nova71

iTrader: (4)

I'm sorry, but I still don't get it. Don't get me wrong, I'm not trying to be a dick, but on Amazon, (just did a quick Google search) the fuel filters are about the same price. Actually, the Vette one is a couple of bucks cheaper? I would use a filter GM designed to work with a performance based V8 rather than a 4 cylinder.

bczee

iTrader: (12)

+1 on ls1nova71... it is what I was thinking.. if GM spec'd out a filter or had the same spec's.. they would have used it, but I am sure they research everything and spec'd out the GF822/WIX33737..
Not that the WIX33100 would not work, but most likely at a reduction in capacity or Services Life.

Just my thinking and having to go with what the GM Engineer have come up with on Requirements and spec's... But everyone is free to use what they want and save a few dollars here and there.. but the only plus on this subject would be the fitting on the output side having a barbed tube for the port.

I wonder if anyone has cut open both of these and compared elements and bypass spring/valve.?

BC

lsxRanger94

Microgard 33737 19.95 at Oreilly auto.

gofastwclass

iTrader: (2)

Because some people enjoy attempting to reinvent the wheel.

Exactly. Those can be a bit noisier than the WIX brand, but they are both in stock at your local O'Reilly.

sprayed99

iTrader: (15)

I have used both part numbers over 20K ish miles and then went to a much larger fuel system.

I had more consistent pressure with the vette filter compared to the 2.2L but both were in acceptable range to function properly. I however do not remember how they hooked up as it was several years I go I messed with those.

Just a thought. Hook it up with the feed from the tank and run hoses off of both ends into bottles. Have someone tap the key on and see which line provides fuel. This is what I did to confirm the proper way to install the filter/regulator.

cwd240z

This method wouldn't work for me as my truck was originally a 4.3L with different style filter connections. I know which lines are which on the truck, but since the filter is from a different application it raised this question.


Also, for the sake of concluding a thread, I did get the truck running last weekend with the 5/16" being the supply from tank and 3/8" the return.

bczee

iTrader: (12)

Suggest you check the fuel pressure at the Rail/Injectors. .but good to hear your up and running !

If it works, it Works !

BC