Re: Stuck on side of the road
[Re: Mike H]
#349935
06/19/09 12:50 AM
06/19/09 12:50 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I had a slanty that would do that cause of a clogged up filter..full of rust start out and be going then drop off and die if you gased it when it stummbled, and you let off and let it coast and slow down it would catch up and go about 1/8 mile and start dieing again drove it under 30 mph all day but 45-55 was out the window and would die off till slowed down so yea a dirty filter could cause it, and just cause I could blow through it,didnt mean zip it was a metal one,I cut open and had a hand full of rust powder and the filter media was clogged full of it swap on a filter and it ran fine for about a yr and then again it was clogged scratchin
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Re: Stuck on side of the road
[Re: sharpie]
#349936
06/19/09 01:14 AM
06/19/09 01:14 AM
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Joined: Dec 2007
Posts: 7,759 So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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What do you have for a fuel pump and what is the pressure? When the motor starts crapping out (but way before it's ready to die) pinch the fuel line close and rev the motor once to clean it out and see if it idles ok for a while with the line pinched. Before the motor runs out of fuel release the fuel flow again. See if it wants to crap out, Repeat
Just something to try.
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: Stuck on side of the road
[Re: meepmeep70]
#349938
06/19/09 10:00 AM
06/19/09 10:00 AM
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Joined: Sep 2007
Posts: 5,037 hi
sharpie
OP
Moparts Linguist
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OP
Moparts Linguist
Joined: Sep 2007
Posts: 5,037
hi
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Re: Stuck on side of the road
[Re: HealthServices]
#349942
06/19/09 03:05 PM
06/19/09 03:05 PM
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Joined: Nov 2004
Posts: 9,312 SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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Quote:
When the motor starts crapping out (but way before it's ready to die) pinch the fuel line close and rev the motor once to clean it out and see if it idles ok for a while with the line pinched. Before the motor runs out of fuel release the fuel flow again. See if it wants to crap out, Repeat
Brian, from the symptoms, it sounds like too much gas is getting dumped into the engine. In the long run, this is not a good thing for the health of the rings, nor the lubricating ability of the oil. Once this problem is resolved, do an oil change pronto.
What Allen is suggesting above has merit as an easy diagnostic tool. If you stop the incoming flow of fuel and the engine can clear out the excess gas and run well for a short time, you have confirmed that fuel is getting past one or both needle valve/seat pairs when it shouldn't be.
At the risk of stating the obvious, consider the function of the needle valves, seats, and floats. The job of the floats is to "float" (duh) on top of the fuel in the bowl. At a preset height, the float presses on the needle valve hard enough so that it "seats" in the seat (double duh) and stops the incoming flow of gas. My educated guess is that this is not happening in your carb. Some of the reasons that spring to mind are:
a. Crazy high fuel pump pressure. b. Crap in the fuel wedging between the needle valve and seat. c. Lousy/broken/worn out tip on the needle valve. d. "Sunk" float. The soldered seams on the brass ones can give out. The phenolic/composite/plastic ones get can get porous over time.
Down to just a blue car now.
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Re: Stuck on side of the road
[Re: 68HemiB]
#349943
06/19/09 04:16 PM
06/19/09 04:16 PM
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Joined: Sep 2007
Posts: 5,037 hi
sharpie
OP
Moparts Linguist
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OP
Moparts Linguist
Joined: Sep 2007
Posts: 5,037
hi
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Steve, the diagnostic makes sense. I'll try that today definitely.
I did check the needle and seat in my carb when I took it apart. It, and the floats, looked alright. I suspect that when I put the Edelbrock carb onto the car, it'll run. Maybe rich, but it will still run.
If so, I will just have to look more into whether it's a fuel pressure problem (can fix with a regulator), or a carb adjustment or float issue. It makes sense that it's doing this, because now that I think about it, I checked the floats before I ran the engine and set them perfectly, then right after I checked them again and fuel poured out of the sight plug when I opened it.
I will also definitely do an oil change. It is almost time anyway, plus I want to take off the Fram filter that I used for break-in (had it lying around, so it was free).
My next question would be - what made the car run fine for four hours, but then suddenly gain this issue while I was idling?
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Re: Stuck on side of the road
[Re: SomeCarGuy]
#349945
06/20/09 01:10 AM
06/20/09 01:10 AM
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Joined: Sep 2007
Posts: 5,037 hi
sharpie
OP
Moparts Linguist
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OP
Moparts Linguist
Joined: Sep 2007
Posts: 5,037
hi
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Well, I 'fixed' it today. I borrowed my friend's Edelbrock 625 or 650 or whatever, slapped it on, fired it up, and it's trouble-free. I know, I know, that's 'parts replacement'. Not helpful. Well, at least now I know it's the carb. I'm going to accumulate some money and look into a Proform metering block (the ported vacuum port on mine is blocked off by a broken tube) and a rebuild kit.
In fact, I have an extra set of fuel bowls with brass floats. I might try them instead of the plastic floats. Anyway, the needles and seats will get replaced as well.
I did notice that the center of the main body that attaches to the metering plate wasn't true, and was bowed inward by about .006 in the center. Maybe that had something to do with everything not working right? I will also stick some carb cleaning pipe cleaner in through every hole.
Just so everyone knows, I'm not giving up on the Holley. I am just glad the issue is resolved.
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Re: Stuck on side of the road
[Re: sharpie]
#349946
06/20/09 01:53 AM
06/20/09 01:53 AM
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Joined: Jan 2003
Posts: 70,126 Here
DirectSubjection
Tacohead. The First and Only
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Tacohead. The First and Only
Joined: Jan 2003
Posts: 70,126
Here
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If you stick with it, I have a rod and spring tuning set around left over from my Olds I'd send you.
i do like the Holleys though, love the 750hp on my Duster.
Ride eternal, shiny and chrome
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Re: Stuck on side of the road
[Re: sharpie]
#349947
06/20/09 08:48 AM
06/20/09 08:48 AM
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Joined: May 2003
Posts: 2,414 St. Croix, US Virgin Islands
David_in_St_Croi
top fuel
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top fuel
Joined: May 2003
Posts: 2,414
St. Croix, US Virgin Islands
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Fuel pouring out of the sight plug is a symptom of a float that is adjusted too high or alternatively as mentioned a sunk float. In addition, the fuel dripping after shut off is a symnptom of too high a fuel level in the bowls.
On our 70 RR with a 383 and a Holley 950 vacuum secondary carb it used to act as if it were running out of fuel at the track, when we were doing 1/8th mile. I finally did the obvious, checked the floats, and they were too low. Fixed it and the problem went away and the car will go full throttle to the 1/4 (finally got back to the 1/4). The running out of fuel symptom just showed up as before the car ran fine, so the float levels can change on their own.n It also said to em that they are pretty sensitive to float levels as it was not many flats on the adjusting nut I had to turn.
A check for a sunk float is when you have the carby apart is to take the float and shake it. If you can hear liquid sloshing, the float is leaking.
Good luck!
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Re: Stuck on side of the road
[Re: sharpie]
#349950
06/20/09 05:28 PM
06/20/09 05:28 PM
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Joined: May 2003
Posts: 4,280 Medford OR
FrankenScamp
master
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master
Joined: May 2003
Posts: 4,280
Medford OR
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Quote:
Well, I 'fixed' it today.
ssswwweeeeeeet! sure they're a pain when they aren't running but once they are you tend to forget about all that.
Now go tear it up some more
Cheers Brian.... see ya @ Jimmy's this year....right?
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