Go Back  Offshoreonly.com > Technical > General Q & A
Gas Hydro Locked? >

Gas Hydro Locked?

Notices

Gas Hydro Locked?

Old 10-08-2021, 09:12 AM
  #1  
Registered
Thread Starter
 
techman's Avatar
 
Join Date: Jan 2005
Location: Mass
Posts: 462
Received 32 Likes on 24 Posts
Default Gas Hydro Locked?

I have a King Cobra 454 with a Holley 760. It's well maintained but has been sitting a while. Went to fire it up the and it wouldn't spin. Pulled the #1 plug and gas came out (not a lot) when running the starter. Engine rotated fine after emptying that cylinder.

#3 had a bit of gas too in it. Pulled carb for a closer look/rebuild.

Can I stuck open float cause this?



techman is offline  
Old 10-08-2021, 09:13 PM
  #2  
Registered
 
Join Date: Oct 2005
Location: Waldorf, Md
Posts: 764
Received 71 Likes on 41 Posts
Default

Gas will definitely lock it up. Have seen it a few times with stuck open fuel injectors. Is yours an electric pump ? I cant imagine it happening with a mechanical pump but I suppose anything is possible.
BillK is offline  
Old 10-08-2021, 09:27 PM
  #3  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 11,642
Received 1,279 Likes on 542 Posts
Default

X 2 : mech or electric pump ?

ive accelerator pumped till bowl has emptied and not hydrolocked But may have gotten lucky those 5-10-20 times. With a mechanical pump it would take a few revs on engine to refill empty bowl. An electric pump is close to instant and would keep spilling over into engine if left in. With mechanicsl it can only pump as engine is spinning.

Fyi: if you hydrolocked you prob have a bent rod from it. I ave several of those trophies.

Are you sure not water from leaking exhaust or etc ?
SB is offline  
The following users liked this post:
liberator221 (10-09-2021)
Old 10-08-2021, 09:32 PM
  #4  
Registered
 
Join Date: Mar 2019
Posts: 745
Likes: 0
Received 136 Likes on 85 Posts
Default

Originally Posted by BillK View Post
Gas will definitely lock it up. Have seen it a few times with stuck open fuel injectors.
Me too and all I did was pull the plugs, turn the motor over with the starter (blowing gasoline all over the place)...reinstalled the plugs and viola.
F14A water jet is offline  
Old 10-09-2021, 07:30 AM
  #5  
VIP Member
VIP Member
 
Join Date: Nov 2005
Location: Wichita, Kansas
Posts: 384
Received 140 Likes on 75 Posts
Default

Well...let's look at the facts.
  • engine would not spin
  • pulled plug(s)
  • engine spins
  • fuel came out of open cylinder when turning with starter

I would say 'objective evidence' says, yes...but I too am anxiously waiting to hear about mechanical or electric pump, though I am 99% sure it's electric.
__________________
Baja 252 Islander
bajaman is offline  
Old 10-09-2021, 10:13 AM
  #6  
Registered
Thread Starter
 
techman's Avatar
 
Join Date: Jan 2005
Location: Mass
Posts: 462
Received 32 Likes on 24 Posts
Default

Electric!
techman is offline  
The following users liked this post:
Gboat (10-23-2021)
Old 10-09-2021, 10:25 AM
  #7  
VIP Member
VIP Member
 
Join Date: Nov 2005
Location: Wichita, Kansas
Posts: 384
Received 140 Likes on 75 Posts
Default

A specific set of events would need to take place to have the carb flood the intake manifold AND have enough fuel make it into a cylinder that HAPPENED to have an intake valve open..but it CAN happen. And as we know from our physics classes...liquids don't compress...
So...does it start and run okay?
__________________
Baja 252 Islander
bajaman is offline  
Old 10-09-2021, 09:21 PM
  #8  
Registered
 
Join Date: Oct 2021
Posts: 4
Likes: 0
Received 4 Likes on 2 Posts
Default

Continuing for Techman who started the thread for me. I went to start the 454BBC. Gas was drained at end of season. Put 5 gallons of fresh gas in the tank. Fresh battery. Put the water to the outdrive. Crank for 5 seconds. Stopped pumped the throttle, cranked 5 seconds and got a brief start. Pumped the throttle a little more, cranked and gradually started cranking slower. Repeated above process, and cranking got slower, little the battery was giving up. Strong smell of fuel. Starter stopped cranking, motor locked. Pulled all plugs. Cranked with no plugs, some amount of excess fuel sprayed out of #1 and #3. But certainly not 1 liter of fuel (no water detected in the engine) let it dry overnight. Pulled the Holley for rebuild. Next day reinstalled plugs and wires, tried cranking and it seems to crank normal. Will reinstall Holley when rebuilt. Appreciate any feedback, but seems like no major internal damage, but I know the fuel we get these days can cause fuel system issues. I have switched to VP racing fuel on my dirt bikes for above reasons. But not feasible in my 55 gallon tank!
Donzi2216 is offline  
The following users liked this post:
techman (10-10-2021)
Old 10-09-2021, 09:42 PM
  #9  
Registered
 
Join Date: Oct 2012
Posts: 1,708
Received 181 Likes on 110 Posts
Default

I would do a compression test to make sure you didn't bend any rods.
underpsi68 is offline  
Old 10-10-2021, 12:24 AM
  #10  
Registered
iTrader: (2)
 
Craney's Avatar
 
Join Date: Oct 2004
Location: Clayton NJ
Posts: 2,175
Received 158 Likes on 80 Posts
Default

Bad battery and flooded.
Craney is online now  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.