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Tech Talk => Engine Mechanical / Electrical => Topic started by: 90ultra21lx on September 16, 2016, 11:12:31 PM

Title: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 16, 2016, 11:12:31 PM

Bought my boat month ago, gs marine tuned up n went thru it, it was sitting for 2 years, so I drained what gas I could, there was less than 1/4 tank in both tanks, filled up new 91 went to puddingstone last Monday it ran great no issues at all, get to Parker today and it won't stay running, acts like not getting fuel, gs just completely rebuilt carb, single pumper dual feed... Help!! At foxs if any mechanics out here! Pm me! So we do a few tests, we take off the hose on bottom of fuel pump,(mechanical) and to my understanding, the hose should b lower than the tanks, so should pour gas out right? No has comes out, just tiny bit..


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 16, 2016, 11:15:26 PM

So we are going to try and replace fuel pump and water fuel separator tmrw morning as long as I can find them here in Parker, if u guys have any suggestions I'd greatly appreciate it!! It's so crazy, ran perfect at puddingstone 4 days ago, literally all I did is put new battery and top one tank off at Parker today??? Someone telling me it may be the dual tank switch? To bypass it?


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: sevans01 on September 17, 2016, 12:34:54 AM

Quote from: 90ultra21lx on September 16, 2016, 11:15:26 PM

So we are going to try and replace fuel pump and water fuel separator tmrw morning as long as I can find them here in Parker, if u guys have any suggestions I'd greatly appreciate it!! It's so crazy, ran perfect at puddingstone 4 days ago, literally all I did is put new battery and top one tank off at Parker today??? Someone telling me it may be the dual tank switch? To bypass it?


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Theres Spanky's and NAPA in town and should have what you need.

If you have in-line fuel filters those get clogged, and need to be changed


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: Jered503 on September 17, 2016, 08:44:14 AM

I'd look at the fuel tank switch, mine was bad when I bought my boat...A hole I bought it from knew it and didn't say anything, let me get stuck out on the water 1st trip out. $30 part


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: irishshawn on September 17, 2016, 10:04:10 AM

I had a port tank issue like that. It was the fuel selector valve was shot. Pull it and replace then take it apart and check the o rings


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 17, 2016, 10:05:06 AM

Quote from: Jered503 on September 17, 2016, 08:44:14 AM

I'd look at the fuel tank switch, mine was bad when I bought my boat...A hole I bought it from knew it and didn't say anything, let me get stuck out on the water 1st trip out. $30 part


It made it act like not getting fuel??

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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 17, 2016, 10:13:53 AM

Quote from: irishshawn on September 17, 2016, 10:04:10 AM

I had a port tank issue like that. It was the fuel selector valve was shot. Pull it and replace then take it apart and check the o rings


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That's the same thing as fuel tank switch right??


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: J2 on September 17, 2016, 10:30:22 AM

Quote from: 90ultra21lx on September 17, 2016, 10:13:53 AM

That's the same thing as fuel tank switch right??


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Yes

If the fuel line will allow you could try running direct from 1 tank to see if fuel switch is the problem. When they go bad you can usually run off of 1 tank.

No to disconnecting fuel line and have fuel run out of line. Pick up tube is on top of your tank reaching down to bottom.

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 17, 2016, 10:11:02 PM

Ok so now it's getting plenty of fuel but still is acting starved, weird question, could it be the alternator? I have no idea how old it is and I know it would make it do weird shit if it was going out... Thanks everyone!!


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: Cliffjumper on September 17, 2016, 11:21:25 PM

Quote from: 90ultra21lx on September 17, 2016, 10:11:02 PM

Ok so now it's getting plenty of fuel but still is acting starved, weird question, could it be the alternator? I have no idea how old it is and I know it would make it do weird shit if it was going out... Thanks everyone!!


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i had this problem with mine kinda. I had water in my tanks. Had to drain both tanks, air them out and refilled them. Blew the lines out and drained the bowls on the carb then everything was fine.

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 18, 2016, 06:32:29 AM

Had a similar problem secondary float was stuck


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: jimpen on September 18, 2016, 07:31:27 AM

I would pull the bowls if you have water in the fuel you will see it then. Check floats and needle & seats. A video would help us help you.


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: goin_up_river771 on September 19, 2016, 10:08:36 AM

Quote from: jimpen on September 18, 2016, 07:31:27 AM

I would pull the bowls if you have water in the fuel you will see it then. Check floats and needle & seats. A video would help us help you.

2nd this .. I had an issue with the fittings at the top of my tanks that the fuel lines connect to clogging/ causing to starve for fuel . Apparently there's a little ball and spring in there that doesn't like old fuel debris.
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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 19, 2016, 12:31:02 PM

Quote from: goin_up_river771 on September 19, 2016, 10:08:36 AM

Sent from the Waterwheel crew

Pull the bowels on the tanks?


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: jimpen on September 19, 2016, 12:58:27 PM

No the bowl's on the carburetor.

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 19, 2016, 01:01:23 PM

Did that no water in fuel so dropping off at gs... Weird stuff man thanks everyone for your help!!


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 21, 2016, 03:48:54 PM

Well got it back from gs today, there was an o ring that came off my quick change jet plates and was clogging the gas in one of the needles or seats...  Seems to b perfect now, gonna take it to puddingstone in the morning to be sure... Thanks everyone for the input!!! 🙏


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 21, 2016, 04:03:25 PM

Glad it worked out.


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: abaca621 on September 21, 2016, 04:11:04 PM

how is puddingstone lake? do they do a inspection?

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 21, 2016, 04:21:13 PM

It's been a while so I'm not sure.


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 21, 2016, 04:24:43 PM

Check their schedule though. They do odd even days for PWC and boats.


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: abaca621 on September 21, 2016, 04:25:56 PM

i will check it out thanks

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 21, 2016, 04:30:53 PM

It is a good lake to tune your idle though. There a large no wake zone on the west side


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: el mojado on September 21, 2016, 04:31:39 PM

Pretty strict with inspections. Odd/even days are enforced from memorial day through labor day. Good luck.

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 21, 2016, 08:28:09 PM

I went to puddingstone like 2 weeks ago, even days are boats, odd is pwc, they don't do inspections, it's like 10-20$ and u can't go past 35 and u have to go in circle. Good to test, oh and u can't go over 12 mph until after 10 am... Nieghbors have a rule, sheriff was quick to come tell me but very cool...


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: GT Jets on September 21, 2016, 09:28:50 PM

Quote from: 90ultra21lx on September 21, 2016, 08:28:09 PM

I went to puddingstone like 2 weeks ago, even days are boats, odd is pwc, they don't do inspections, it's like 10-20$ and u can't go past 35 and u have to go in circle. Good to test, oh and u can't go over 12 mph until after 10 am... Nieghbors have a rule, sheriff was quick to come tell me but very cool...


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WTF?

Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 22, 2016, 08:04:26 AM

Quote from: GT Jets on September 21, 2016, 09:28:50 PM

WTF?

Haha yea 12mph till 10 am it was random I thought too


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 22, 2016, 08:30:07 AM

Pipes are still loud at 12mph 😀


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: 90ultra21lx on September 22, 2016, 08:37:59 AM

Lol I swear my boats louder at 12 than 25-30 I told him that n he kinda shrugged like hey man rules are rules lol


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Title: Re: 454 won't stay running, idles when cold shuts off under load
Post by: angermgmt on September 22, 2016, 08:58:20 AM

 They bought houses by the "Lake". Hello...


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