Fun, Not Fun, Fuel hose Options

[ChrisFoley]

@rjames I do not have a filter before the pump, only the sock in the tank. One of the local suggestions was a WIX 33274. Roughly 10mm on one side and 12mm on the other. Filter and adapter both. The hose I am trying to use is only 10 inches from the tank to the pump. I will see if I can fit the filter inline there and make it work somehow.

@technicalninja one of my first stops was the adapter page for Tangerine. He does not have a 10mm to 12mm adapter yet. Maybe we can show him the need for one.

Get the 33274 and one of my adapters. I use 1/2" FI hose or race hose for the 12mm fittings between filter and pump.

[NARP74]

@ChrisFoley that would make 6 connections and chances for leaks in a 10 inch piece of hose. I was hoping to avoid that.
I did test fit the 1/2" on the larger filter end and the pump and it seems fine.

[r_towle]

OD 12mm/8mm

The VW bingo item to solve all your issues.
The fuel filter rjames posted

[ChrisFoley]

@ChrisFoley that would make 6 connections and chances for leaks in a 10 inch piece of hose. I was hoping to avoid that.
I did test fit the 1/2" on the larger filter end and the pump and it seems fine.

You should have a filter before the pump. No need for a filter after the pump. This doesn't increase the total number of connections needed.

[Superhawk996]

Be careful with the generic term fuel filter. Filtration size matters.

Proper fuel system is:

• Pre filter / sock (typically 100-150 micron) 914 in tank sock is in this range.
• Pump
• Post filter (10 micron FI, 30 micron carb)

The new Bosch “200” pump that replaces the legacy 044 now has a 300 micron filter built into the pump. I’ve seen conflicting information that the built in filter screen is 130 microns - this would be more typical. Bosch used to not warranty the 044 pump if a pre-filtration sock was not used and fuel contaminated the pump was the cause of failure.



[edit] the only issue I have with the 914 in tank sock is that the filtration area is much smaller than a modern in tank sock. As long as the tank doesn’t have pre-existing rust contamination, this is a non-issue with modern clean fuel as ninja notes.

[technicalninja]

Modern cars dropped anything but the internal sock in the tank about 20 years ago...

No filters at all is the norm now!

Diesels still have filters, but they are shrinking fast.

I was wrenching during the fuel distribution fiasco in the late 80s.

A major supplier got poisoned at the main distribution hub and the resultant claims of 6 billion dollars (remember this was the 80s) bankrupted them.

You could not clean carburetor bodies, replacement only.
If it was FI (rarer then) it was more expensive.

Fuel got SO clean in the aftermath that filters were far less important.

Whole bunch of new "storage" laws were put into effect.

[NARP74]

I do want a fuel filter before the pump and am trying to fit that in. I have a fuel filter on the engine, Porsche part, probably before the fuel rail. I have not looked at that in a while.

So to reiterate since we are beyond 20 posts. I am going from the 10mm supply line on the tank to a 12mm on the fuel pump. If I add the filter, it is 8mm and 12mm. So then I need to go from from 10mm at the tank to 10mm on an adapter, 8mm on an adapter to 8mm on the filter, then 12m on the filter to 12mm on the pump. That is 6 connections.

I have not looked much yet, any filters that are 10mm and 12mm connections?

[Superhawk996]

What Bosch pump are you using?

The super common 044 pump has the ability to charge the inlet size via thread in fitting. Can you change the inlet on yours?

The root cause of your struggle is this 1/2” inlet. Why so attached to that pump?

[technicalninja]

@rjames I do not have a filter before the pump, only the sock in the tank. One of the local suggestions was a WIX 33274. Roughly 10mm on one side and 12mm on the other. Filter and adapter both. The hose I am trying to use is only 10 inches from the tank to the pump. I will see if I can fit the filter inline there and make it work somehow.

@technicalninja one of my first stops was the adapter page for Tangerine. He does not have a 10mm to 12mm adapter yet. Maybe we can show him the need for one.

Get the 33274 and one of my adapters. I use 1/2" FI hose or race hose for the 12mm fittings between filter and pump.

You figured it OUT on post number 8.
I said "Hell yes! easy button" on post 9


And then Chris Foley advised to use same filter...
He thought you were going down to 8mm and would ALSO need his little adaptor.
Many have been confused by the 10 X 12 numbers and the little square filter r-towle posted would get the 8 X 12 that most posters got stuck in their brain!

To me it sounds like the WIX 33274 will work fine for your application.

I am in agreement with SH about being stuck on an old Bosch pump...
Why?

[NARP74]

@Superhawk996 not attached to it at all. It was on the car when I bought it, although mounted poorly and wired even worse. I agree that 12mm is causing extra connection issues.
Bosch 0 580 464 069

[NARP74]

The 33274 I bought is in a MicroGard box and is really 8mm and 12mm. If it was 10mm and 12mm I would not be having this issue.

[Superhawk996]

@Superhawk996 not attached to it at all. It was on the car when I bought it, although mounted poorly and wired even worse. I agree that 12mm is causing extra connection issues.
Bosch 0 580 464 069

I see. So fixed inlet.

Food for thought:

That is a turbine pump vs the common 044 style roller element pump.

Turbine pumps are typically more efficient and quieter but not by much. Turbine pumps sometimes can have a high pitch whine that I personally find “noisier” than the roller pumps but that may just be nuance if my own hearing sensitivity to certain frequencies. YRMV.

Turbine pumps are more prone to ejecting garbage into the fuel system if the turbine gets compromised.

Turbine pumps are the most sensitive pump design to contamination.

If it were me, I’d seriously consider moving to a 044 / new “200” roller element pump.

This gets you:
An inlet that allows you to choose 10mm / 3/8” nipple.
A pump that is more robust to external fuel contamination

[NARP74]

Pump and bracket

[NARP74]

So Bosch 0 580 464 200 appears to be threaded on both ends now. Am I just trading one problem for another?

[Craigers17]

I might be over or underthinking the issue here, but when I replaced my filter, I had to reduce the incoming line from the tank as well. I just bought two barbed fittings from ACE Hardware..... I THINK one was a 3/8's x 1/4 female and the other was a 5/16's x 1/4 male. These might not be the exact sizes you need, but ACE will probably have several options. You can buy some fuel rated plumber's tape there as well, and just connect the two fittings. I would just make sure the plumber's tape isn't applied too far down on the barb where it can get into the line. Just my two cents. ...and yes, I need to replace that piece of gray fuel line with a higher grade black piece!

Here's a link to the what the two pieces look like:

https://www.acehardware.com/air-hose-fittings/1892587

[Superhawk996]

So Bosch 0 580 464 200 appears to be threaded on both ends now. Am I just trading one problem for another?

Yeah - I get the concern. Trading a fixed inlet for a threaded inlet.

But the reality is the threaded outlet is under pressure (5 bar) on most of the Bosch pumps and there isn’t a history of leakage.

[Superhawk996]

I might be over or underthinking the issue here,

I don’t think you are. This was discussed early in the post not sure why the thread drifted away from that other than the consideration of “ideal” solution and that an adapter adds potential leak paths.