Fuel system losing prime - Chevy and GMC Duramax Diesel Forum
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Old 12-06-2012, 08:03 AM   eBay Motors  #1 (permalink)
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Fuel system losing prime

I recently installed a Cat fuel filter & adapter from alligator performance. Since the install, if the truck sits for a few hours, I have to pump the primer on the filter head to get it to start. I'm not leaking any fuel anywhere. Any ideas what could be causing this?
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Old 12-06-2012, 01:33 PM   eBay Motors  #2 (permalink)
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You need to replace the orings in the filter head. Look up the filter head rebuild kit from merchant automotive....






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Old 12-07-2012, 07:23 AM   eBay Motors  #3 (permalink)
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That was going to be my next question.
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2005 2500HD CCSB 4x4 - AFE lbz intake, lbz MP, pcv re-route, egr blocked, 4" DP back straight pipe, 285's on stock aluminums, Insight CTS, bully dog tuner-SOLD
2000 F-350 CCLB 4x4 - CAI, 4" straight pipe, Edge evolution, Isspro gauges, leveled on 35's
1960 F-250 4x4
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Old 12-09-2012, 05:51 PM   eBay Motors  #4 (permalink)
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same thing happening to me. i'm just wondering WHY after changing to a cat fuel filter it's doing this?
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Old 12-10-2012, 02:02 PM   eBay Motors  #5 (permalink)
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Update - mine seems to be doing better; hasn't acted up for 2 days. Maybe just took longer to purge all the air out of the 2 micron filter?
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1960 F-250 4x4
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Old 12-10-2012, 03:07 PM   eBay Motors  #6 (permalink)
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Quote:
Originally Posted by KB3MMX View Post
You need to replace the orings in the filter head. Look up the filter head rebuild kit from merchant automotive....
But it works just fine without the Cat adapter.
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Old 12-10-2012, 03:20 PM   eBay Motors  #7 (permalink)
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lol i'm glad i'm not the only one with this problem!
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Old 12-10-2012, 07:44 PM   eBay Motors  #8 (permalink)
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I just installed the cat filter adapter last weekend and was having the exact same issue with it losing its prime. I ended up putting the stock fuel filter back on (because I don't have time to mess around priming it now) and it has been working flawlessly ever since. So this tells me it can't be the rebuild kit in the filter head. I didn't leave it on long enough to see if it would eventually work. Once I have time I'm going to inspect the orings on the filter adapter and put it back on. I have also read that one other guy had this issue and removing the check ball and spring fixed his problem so I might try this as well. (I don't see any harm in removing it??) if anyone finds a solution to this problem please let me know. As well if I get it figured out ill be sure to post.
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Old 12-10-2012, 07:47 PM   eBay Motors  #9 (permalink)
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the CAT filter is ALOT bigger than the stocker. priming it can take alot longer than you're used to. lots of places for air in that thing
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Old 12-10-2012, 07:57 PM   eBay Motors  #10 (permalink)
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Yeah that makes sense. I just figured after pumping it with the bleed screw open it would be enough. But I'll definitely try pumping it up and leaving it on there for a while. Thanks!
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2010 GMC SIERRA 2500HD BLACK CCSB LMM
EFI LIVE W DSP5 FROM IDAHO ROB
EDGE INSIGHT CS W PYRO
RESONATOR PLUGGED
SDP EGR DELETE KIT W LB7 UP PIPE
MAGNAFLOW DOWNPIPE
MAGNAFLOW 4" STRAIGHT PIPE
CAT FILTER ADAPTER
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