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  View original topic: Consequences of a reversed fuel filter?
summerof78 Fri Aug 15, 2025 9:33 am

I'm looking at a 1970 T1 and the guy admits it won't start/run.

He sends me a pic of the engine and the first thing I notice is the filter is on backwards!

Can permanent damage result from this on an ACVW engine, or is it just a silly, reversible mistake, so to speak?

KTPhil Fri Aug 15, 2025 10:04 am

No damage, unless it was clogged with crap and THEN put on backwards, which would send the gunk into the carb.
Filter shouldn't be in the engine bay anyway, unless its metal and clamped to something so it doesn't shake. Put a metal one (and write the date on it) and mount it next to the tranny.

summerof78 Fri Aug 15, 2025 10:49 am

Thank you. From what I could make out from a web search is that performance would certainly suffer and it could screw up the fuel pump from continued backwards pressure.

busdaddy Fri Aug 15, 2025 11:00 am

It depends on how clean the tank and system is, if it's making lots of crap a rreversed filter will clog up quickly (less surface area), if it's fairly clean then you may never notice an issue.

But look at it as an indicator of the skill level of the person maintaining the car, count on many other surprises.

summerof78 Fri Aug 15, 2025 11:12 am

busdaddy wrote: But look at it as an indicator of the skill level of the person maintaining the car, count on many other surprises.

Certainly crossed my mind! :shock:

KTPhil Fri Aug 15, 2025 12:01 pm

busdaddy wrote: It depends on how clean the tank and system is, if it's making lots of crap a rreversed filter will clog up quickly (less surface area), if it's fairly clean then you may never notice an issue.

But look at it as an indicator of the skill level of the person maintaining the car, count on many other surprises.

Yes, this is a warning!

Like when I found a PO had "bridged" the front clutch cable eye and the pedal arm with a big PAPER CLIP, being too lazy to unhook the back and do it again. I thought back to the sale discussion where he proudly said he had rebuilt the engine recently... surprisingly, the engine lasted a couple more years!

scottyrocks Fri Aug 15, 2025 2:04 pm

If that's all that's causing it to run poorly, and he's selling it in not running condition, you could be sitting on gold.

summerof78 Fri Aug 15, 2025 2:26 pm

scottyrocks wrote: If that's all that's causing it to run poorly, and he's selling it in not running condition, you could be sitting on gold.

That thought also crossed my mind, but not sure how realistic that is. Probably more wishful thinking on my part... #-o

Bobs67vwagen Sat Aug 16, 2025 5:13 am

If you can post the picture that was sent to you, more "faux pas " may be revealed.

summerof78 Sat Aug 16, 2025 9:09 am

Bobs67vwagen wrote: If you can post the picture that was sent to you, more "faux pas " may be revealed.

Not a very good pic, but have at it!



Bobs67vwagen Sat Aug 16, 2025 10:43 am

Hard to see any detail on that photo. I can see the left side fan housing tube to the muffler is either missing or not connected which if run like that for a while is not a good sign. Kind of surprising to see the one year only reflectors on brackets from the bumper still there. Alot of those are long gone.

EverettB Sat Aug 16, 2025 4:15 pm

It looks like maybe the vacuum line came off the carb.

I'm not sure that would affect idle but it could drive like crap with the distributor not advancing

summerof78 Sat Aug 16, 2025 5:59 pm

That vacuum line has definitely seen better days.

zerotofifty Sun Aug 17, 2025 7:13 am

Likely none

KTPhil Sun Aug 17, 2025 1:49 pm

Maybe this helps:



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