Re: Can it be done with the stock fuel tank?
[Re: rjones]
#268068
03/27/09 10:51 AM
03/27/09 10:51 AM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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do you have a fuel pressure gauge in the cockpit?
for what is the good life if not doing things thoughtfully?
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Re: Can it be done with the stock fuel tank?
[Re: rjones]
#268071
03/27/09 11:19 AM
03/27/09 11:19 AM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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that's correct about fuel volatility nowadays. i have a similar combo- 496 in an a body, street/strip. it runs 7.0 at 3500 feet in blazing desert heat. stock fuel tank, carter mechanical pump, 3/8 line, and no fuel delivery problems at all. as a matter of fact, it had no problems with the 5/16 line either! i suspect you've got a problem possibly with your pickup, or with your system configuration. have you tried running both pumps? what kind of filter arrangement do you have?
Last edited by maximum entropy; 03/27/09 11:20 AM.
for what is the good life if not doing things thoughtfully?
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Re: Can it be done with the stock fuel tank?
[Re: rjones]
#268074
03/27/09 11:41 AM
03/27/09 11:41 AM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
master
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master
Joined: Feb 2007
Posts: 5,080
organ
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i have mechanical only. i may add an electric if i make more power. what type of filter do you have? where is it located?
for what is the good life if not doing things thoughtfully?
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Re: Can it be done with the stock fuel tank?
[Re: rjones]
#268076
03/27/09 01:01 PM
03/27/09 01:01 PM
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Joined: Aug 2003
Posts: 43,237 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,237
Bend,OR USA
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Quote:
The fuel pump is about 2 months old with maybe 500 mile on it.
Guys with stock tanks, where do you have your electric pumps mounted?
Thanks,
Roger
My pump is mounted at the rear of the right rear sub frame behind the fuel sump. It is fed by a #10 hard line and from the pump it is a # 8 to the regulator in the front. It sounds like you are running out of fuel, my car started out with a Magna Fuel 275 pump and I ended up having to change it to a Magna Fuel 300 due to running out of fuel from the starting the line to the finish line according to my wide ban O2 sensor. The car ran 10:73 at 127 mph running out of fuel and didn't indicate that it was lean during the run I don't have a fuel pressure gauge that I can see during the run also It also sounds like the current system is marginal now and probally won't get better with age unless you upgrade the pump or find out if and what is restricting the fuel flow to the motor. I was taught that if the fuel pressure drops during the run you need a beter fuel delivery system I have seen cars go in the low nines with a single Holley blue pump and pick up three tenths and 4 MPH by replacng that pump with a bigger pump, that was a NOS car that didn't miss or burn up spark plugs during those runs He treid jetting the car up two jet sizes at a time five times(10 jet sizes ) and the car ran within .05 ET and .25 MPH on all five runs My is get a better pump, a lot better now so you won't have to do what I did, buy a good pump twice
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Can it be done with the stock fuel tank?
[Re: Cab_Burge]
#268077
03/27/09 03:57 PM
03/27/09 03:57 PM
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Joined: Jan 2003
Posts: 4,296 Chicago, IL
TonyS451
master
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master
Joined: Jan 2003
Posts: 4,296
Chicago, IL
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You might also check your needle and seats to make sure nothing is stuck in there. I had that happen before where a little piece of rubber from a braided hose got lodged in there.
2 kids and a dog
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Re: Can it be done with the stock fuel tank?
[Re: rjones]
#268082
03/27/09 09:56 PM
03/27/09 09:56 PM
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Joined: Feb 2004
Posts: 34,933 S.E. South Dakota !
bigdad
Still Posting A Lot
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Still Posting A Lot
Joined: Feb 2004
Posts: 34,933
S.E. South Dakota !
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Aeromotive makes a in tank sump and pump now if you want to use a stock tank .. Looks decent to me
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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Re: Can it be done with the stock fuel tank?
[Re: bigdad]
#268083
03/27/09 10:42 PM
03/27/09 10:42 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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if it was vapor lock i would think it would happen sooner but i will tell you that the mallory 140 pump with return style reg (4309) was one of the best things i have done to my car. i had bad vapor lock issues with original six pack setup i had and that took care of it
also, i dont think fuel line inside the car is a good idea
Last edited by sixpackgut; 03/27/09 10:44 PM.
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
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Re: Can it be done with the stock fuel tank?
[Re: cgall]
#268086
03/28/09 08:06 AM
03/28/09 08:06 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Unhook your fuel line from the carb and stick it in a 5-gal bucket. Run pump and use a stopwatch to time how long it takes to fill the bucket.
Post results back here tomorrow before 4:00 PM Eastern, I have something to do after that.
do the fuel flow test first. You have 2 fuel related issues 1) vapor issue which most likely is just the gas you buy. Right now you are buying winter grade fuel which has a RVP of about 15psi for easier winter starting (when temps are real cold) but if the temps warm up it boils very easy also if it has any alky in it it boils all the easier yet, Summer grade fuel has a much lower RVP of about 8.5 which doesnt boil as easy 2) You have a supply issue, your fuel gauge showed you this... it dropped to 1 psi.... do the flow test and if it shows low start working backwards toward the tank looking for any kinks in the line or any blockage
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