360 Fuel Starve Problem
#114813
09/03/08 09:02 PM
09/03/08 09:02 PM
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Joined: Dec 2004
Posts: 890 Clarksville, Tennessee
monoptn
OP
mopar addict
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OP
mopar addict
Joined: Dec 2004
Posts: 890
Clarksville, Tennessee
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Tonight I took my demon to the 1/8 mile for the first time.
It's a 76 360, heads ported, 2.02 intake valves, about 9.5 compression. Cam is about a .440 lift. Edelbrock airgap intake, capped with an edelbrock 750. It has mopar performance electronic ignition, orange box. 3.55 rear. The fuel pump is a standard mechanical pump, and the carb has no spacer. This was a /6 car, and I'm still running the 5/16 fuel lines. The air temp was 85, and my engine temp was about 205-210.
On most all of my runs, the motor acted like it was starved for fuel. Usually, this would be at higher RPMs, but not always. Several times it starved from the start, and I was not on it hard at the start, because I have an open rear.
My first thought is that the sock in the fuel tank may be plugged, and I'm gonna remove that this weekend. Next, I'm thinking vapor lock, and then float settings in the carb. What do you all think?
My best run was 9.05 at 80.865. It was really the only run where it pulled hard the whole way. On some runs, it lost almost all power right from the start, and I just nursed it through the line.
I did manage to beat a 72 Chevelle 2/3 times, and would have been 3/3 except for the fuel starve! O
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Re: 360 Fuel Starve Problem
[Re: IcorkSOAK]
#114815
09/03/08 09:09 PM
09/03/08 09:09 PM
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Joined: Dec 2004
Posts: 890 Clarksville, Tennessee
monoptn
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mopar addict
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OP
mopar addict
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Posts: 890
Clarksville, Tennessee
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What would be the carb/intake temp that would cause vapor lock? I am at about 600 ft. above sea level.
Last edited by monoptn; 09/03/08 09:38 PM.
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Re: 360 Fuel Starve Problem
[Re: monoptn]
#114820
09/04/08 03:11 PM
09/04/08 03:11 PM
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Joined: Jan 2003
Posts: 1,051 Slidell, La.
doctor_mopar
super stock
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super stock
Joined: Jan 2003
Posts: 1,051
Slidell, La.
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Sounds like mostly carb problems, but I would also add a high volume pump, even a mechanical pump.
------------------------ It doesn't matter what you do.........As long as you look good doing it !
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Re: 360 Fuel Starve Problem
[Re: doctor_mopar]
#114821
09/04/08 03:19 PM
09/04/08 03:19 PM
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Joined: Jan 2003
Posts: 13,690 md
mopars4ever
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,690
md
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Quote:
The TRUTH will be told if you put a fuel pressure gauge on it.
Easiest way to find out before your start taking things apart. mike
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Re: 360 Fuel Starve Problem
[Re: mopars4ever]
#114822
09/04/08 04:29 PM
09/04/08 04:29 PM
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Joined: Apr 2005
Posts: 12,271 Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Ditch the carb and 5/16 fuel line. Try to get a fuel pressure gauge on it. If it's acting like that on an 1/8 mile run, you got problems.
Patiently waiting for the 5/16 line feeds 440's crowd...
Last edited by RobX4406; 09/04/08 04:32 PM.
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Re: 360 Fuel Starve Problem
[Re: monoptn]
#114824
09/04/08 11:41 PM
09/04/08 11:41 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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well 5/16 line feeds 440's so .....
personally, the motor doesnt sound all that big to need more fuel line. thats a small cam.
i would be checking fuel pressure before I started changing stuff. What rpm is it dying at? maybe valve float.
btw, I put 3/8in mine though- just to make sure
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Re: 360 Fuel Starve Problem
[Re: monoptn]
#114826
09/08/08 07:37 AM
09/08/08 07:37 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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it couldnt hurt to put a better mechanical pump on it. i run the carter street/strip mechanical pump (i think its the 6902)
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Re: 360 Fuel Starve Problem
[Re: RobX4406]
#114827
09/08/08 07:51 AM
09/08/08 07:51 AM
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Joined: Jan 2003
Posts: 7,978 Bethel Ct
AdamR
master
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master
Joined: Jan 2003
Posts: 7,978
Bethel Ct
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Quote:
Ditch the carb and 5/16 fuel line. Try to get a fuel pressure gauge on it. If it's acting like that on an 1/8 mile run, you got problems.
Patiently waiting for the 5/16 line feeds 440's crowd...
My 70 Cuda went mid 12s with a 440 and 5/16 line. Fast69=8Plymouth has gone low 11s on a 5/16 line, AbbodyJoe low 12s with 5/16 line and a stock pump.
That said I would upgrade to 3/8 line, a better pump and loose the Eddy 750. The 750s seem to have problems. I have had great luck with the 600s, I hear the newer AVS 650s and 800s are great if thats the style carb you want. Other wise slap a 750 double pumper on it and call it good.
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Re: 360 Fuel Starve Problem
[Re: monoptn]
#114829
09/08/08 12:30 PM
09/08/08 12:30 PM
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Joined: Jan 2003
Posts: 1,051 Slidell, La.
doctor_mopar
super stock
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super stock
Joined: Jan 2003
Posts: 1,051
Slidell, La.
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A shield should work. You would be suprised how much fuel you can flow through a 5/16 line, of course an upgrade to 3/8 is good, if everything else is working. The filter and sock should help most, but I found that a high volume pump makes a great difference too.
------------------------ It doesn't matter what you do.........As long as you look good doing it !
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Re: 360 Fuel Starve Problem
[Re: monoptn]
#114831
09/11/08 09:58 PM
09/11/08 09:58 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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I had fuel delivery issues with 2 stock pumps on my warm 360. Switched to the Carter street pump and the problems were cured. the Carter street pump comes without hose barbs on both sides, you can pick them up at your local hardware store.
AVS carb design needs at least a 1/2" phenolic or wood spacer beneath the carb, or they will get vapor lock. Mine (and most) showed up on hot restarts, as the fuel would boil out of the carb and leave it full of vapor (which will not pump). Never had a vapor lock problem while the car was under way (but did have the mentioned fuel delivery problems where the stock pump could not keep up with the engine requirements).
Last edited by GO_Fish; 09/11/08 10:04 PM.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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