Skip to main content
Topic: Generator plastic spin-on fuel filter failed (Read 920 times) previous topic - next topic

Generator plastic spin-on fuel filter failed

Just had an exciting time with the generator.  The shop that did oil and filter change on the generator (Power Tech Isuzu 8 KW) installed a spin-on all plastic Fleetguard fuel filter in mid-April.    I was sitting inside the coach running the generator, heard it start to miss and slow down and then the Xantrex charger and the roof AC complained and shut down.  Opened the generator door and found the fuel filter completely off and sitting on the deck with fuel streaming out.    For some reason the generator was still running.  Shut the gen down and then tried to reinstall the filter but the threads were stripped, and it just fell off again.

My take on it is that the installer overtightened the filter and the plastic threads were just about ready to go, and over the time since mid-April, the threads completely failed.
I had a new metal NAPA filter and installed it, and (after a massive clean-up of the spill) all is working fine, but I'll never let a plastic spin-on be installed again.  If you check your generator and see a plastic spin-on, and you didn't install it (or didn't follow the exact tightening directions,) I'd replace it.

Googled for problems with plastic spin-on filters, and it seems that many filters - presumable not the big ones used on our main engines - are being supplied in that form now.  Some say no problems with them, but there was one thread that said that NAPA had pulled all the plastic ones off their shelves.  Another comment was that the metal ones will no longer be supplied.  I'm gonna see if I can stock up on metal ones if they are still available.

Dave and Nancy
1999/2013 U270 36' Xtreme
Motorcade # 16774
2013 Subaru Outback
KD0NIM

Re: Generator plastic spin-on fuel filter failed

Reply #1
Sorry to hear about your filter problem, this is why I trust very few with my equipment and servicing it.

With the plastic filters, we have been using the plastic secondary fuel filters on the  Cummins B & C series engines for a few years, have never had a problem yet.

Any Meat Head can over tighten anything until it strips, then back up a 1/4 turn, hoping no one will ever notice or care.

Not every shop has smart, experienced or concerned mechanics, so buyer beware.
Hate to be so down on this type subject, but I have worked in this field for over 50 years, I should write a sad joke book on the stupid things I've seen, and the cost to the poor customers along the way.
Thank goodness not all shops work this way, it is just hard to find the good ones when your on the road.  So keep asking about the good shops, they are around.
MO
Dave

Re: Generator plastic spin-on fuel filter failed

Reply #2
There are many filters that are used on the generator.

The Racor R-12 filter is commonly used.  Photo below.

Re: Generator plastic spin-on fuel filter failed

Reply #3
Here's the replacement I used and prefer  - NAPA 3386, and it's metal!  Hope I can still get them.  The one that failed was all plastic but screws on in the same way.

Dave and Nancy
1999/2013 U270 36' Xtreme
Motorcade # 16774
2013 Subaru Outback
KD0NIM