Holley Flooding Issues
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=2545
Printed Date: November-23-2024 at 7:37am
Topic: Holley Flooding Issues
Posted By: Guests
Subject: Holley Flooding Issues
Date Posted: October-03-2005 at 12:19am
|
I am having some flooding issues with my holley on my 1980SN 351. It was trickling out of the primary pipes after shut down, but last time out actually poured out of the pipes when running - then stalled out. It kept on flowing after the stall.
I am fairly confident that the problem will be debris holding the needle & seat open as the previous time out we ran out of fuel about 20' from the ramp 
Am I most likely correct in my diagnosis? I have removed the carb, drained fuel, cleaned both fuel bowls and reassembled with new gaskets. I have then primed the carb with fuel using a hand fuel primer and found no leaks. I will be installing an in-line fuel filter to catch any further debis. Sorry for the super long post. |
Replies:
Posted By: skyhawkflyer
Date Posted: October-03-2005 at 9:47am
|
You are correct in your prognosis, although that may not be the only problem. A sunken float will do the same. To test the float submerse it in a jar of hot water and look for a stream of escaping air bubbles from a hole. No bubbles no hole. A bad float may take several days to actually sink, so you need to check that as well.
Did you find trash in your needle and seat? If you physically see the problem then I would agree with you that it's fixed, but if you didn't notice anything wrong with your existing needle and seat then you need to keep looking. A fuel filter is a great idea! CLEAN fuel is the secret to keeping your carb in good condition. Fuel stabilizer in the winter layup time will help ensure that those needles and seats don't get gummed up! ------------- |
Posted By: David F
Date Posted: October-03-2005 at 12:34pm
| I kept having the flooding problem year after year or month after month even after cleaning the debris from the carb and installing a water seperator/fuel filter. I eventually had to replace the carb due to corrosion in the fuel bowls. The corrosion was the source of the debris that fouled the needle vavle. No filter would stop it obviously. |
Posted By: skyhawkflyer
Date Posted: October-03-2005 at 12:55pm
|
If my carb ever gets to that state then I'm going to replace it with throttle body fuel injection. I've been really lucky so far, I haven't had any troubles at all. Running some HEAT through the fuel system every now and then will help keep the water out. I think that stuff is basically alcohol, water mixes with alcohol, alcohol mixes with fuel......
I've never noticed any water in my tank, and I check it about once a month visually through the filler neck. ------------- |
Posted By: Guests
Date Posted: October-03-2005 at 8:37pm
|
Thanks for the replies. I do have some evidence of corrosion in the bottom of the primary fuel bowl. I did not however find anything jamming the needle & seat open. I figured that it probably removed itself during drainage & disassembly???
I have left the carb full of fuel for the last couple of days - so I will try & pump more fuel into it tonight to see if the float may of sunk. I did also replace the power valve whilst the bowls were off, I'll check to see if maybe there was a hole in the old one, Thanks again for all your help. |
Posted By: skyhawkflyer
Date Posted: October-04-2005 at 9:08am
|
Look at it closely with a magnafying glass under a bright light. If it's old chances are it will be full of cracks. ------------- |