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Old 15-11-2012, 05:32 PM
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Fuel system

At the moment I am running my pro-star 500 (there is a bypass at the pump feeding back into the tank, it apparently stops cavitation and is set to around 16psi) feeding into a magnafuel deadhead reg which feeds the fuel rail. I was thinking of switching it to feeding the fuel rail direct( no reg between the pump and the rail) and running a return line with a bypass reg in it and blocking off the pump bypass, the theory is it should help keep the fuel cooler. What are you guys running?
I am also thinking about ditching the 500 and going back to something a little quieter and better suited for the street. I can`t seem to get even a decent price for the car so am thinking about making it a little more street friendly and stop racing/breaking the bloody thing and just drive it. What fuel pumps you guys recommend, I had a hp150 but it died.
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Last edited by chevguy; 15-11-2012 at 05:37 PM..
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  #2  
Old 15-11-2012, 05:59 PM
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http://www.summitracing.com/search?k...2-454-20&dds=1
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Old 15-11-2012, 06:02 PM
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Do you like hot fuel and vaporlock Jimbo?

500GPH is way too big.

There should be plenty of fuel system schematics on various fuel system part websites.. I know that Holley have them.
I like the idea of the reg after the fuel rail and downsizing the pump..
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Old 15-11-2012, 06:09 PM
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I must do
That's what's on mine and I don't have any of said issues
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Old 15-11-2012, 06:10 PM
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Contact Robb, he doesnt list the BBC pump for big HP engines but he can make you one, this guy really knows his stuff, worth a phone call

http://www.robbmcperformance.com/products.html
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Old 15-11-2012, 06:18 PM
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Originally Posted by rodent View Post
I must do
That's what's on mine and I don't have any of said issues
With oe horsepower, I'm sure the mech pumps work fine although vaporlock has always been a common issue with stock carbed cars until fuel injection where tank mounted pumps became the norm.. Now, vaporlock it's practically non-existent.
I tried an oe pump, then a street/strip then a race pump.. Never got rid of vaporlock until I fitted a rear mounted (electric) pump. Fuel flashes to vapor in a vacuum and with more power, the bigger the pump, the more it sucks!
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Old 15-11-2012, 06:24 PM
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I had Mech on my blown(818hp)Big block and never had vapor lock dramas.......sorry bro but I've gotta call Bull5hit to your theory

Because YOU cannot get something to function correctly dood, it doesn't mean others can't
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Old 15-11-2012, 06:27 PM
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Well done, but it ain't a theory..
http://en.wikipedia.org/wiki/Vapor_lock
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Old 15-11-2012, 06:31 PM
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PS: Maybe your 5hit just gets to hot trying to push that 4 ton Camaro of your around

---------- Post added at 07:31 PM ---------- Previous post was at 07:28 PM ----------

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Well done, but it ain't a theory..
http://en.wikipedia.org/wiki/Vapor_lock
I never said that "vapor lock" was a theory................I was commenting on the Bull5hit that your spruiking about mech pumps not working on anything other than stock
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Old 15-11-2012, 06:31 PM
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That's a theory. ..and a 5hit one!

No, I said even stock cars with mech pumps experienced vaporlock too..
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Old 15-11-2012, 06:44 PM
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That's a theory. ..and a 5hit one!

No, I said even stock cars with mech pumps experienced vaporlock too..
So your saying that both stock and modified engines get vapor lock with mech pumps......right? If that's the case, why do companies keep throwing cash at the problem and then selling them to us? Only to have us(the consumer)pull them and toss them for an electric?

---------- Post added at 07:44 PM ---------- Previous post was at 07:39 PM ----------

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Contact Robb, he doesnt list the BBC pump for big HP engines but he can make you one, this guy really knows his stuff, worth a phone call

http://www.robbmcperformance.com/products.html
Don't try and hijack this already hijacked thread with your commonsense Pal
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Old 15-11-2012, 06:49 PM
1956SedanDelivery 1956SedanDelivery is offline
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Same pump at Rocket
http://www.ebay.com.au/itm/HOLLEY-ME...item3a589cbc78

I learned a long time ago that a return line cures any vapor lock, mechanical or electric pump and would tell anyone that doesnt already have one to put one on.

Im just about to use a Race pump on my 454 about 600/650hp for my street car and it will have a return line for sure.

Last edited by 1956SedanDelivery; 15-11-2012 at 06:55 PM..
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Old 15-11-2012, 06:53 PM
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They are a lot more likely to vaporlock. I think that's obvious.
I certainly wouldn't be advising anyone with a half decent engine to use an engine mounted pump..
Do your own research Jimbo.. To push fuel forward, you need several psi just to overcome G-forces at the track, plus what the carb needs, which is why track-intended electric pumps output ~15psi only to then be deliberately reduced at the carb by the reg. You're suggesting a vacuum in the fuel line instead..
Mine suffered vaporlock under hard acceleration which was hardly surprising when you think about it.

What did your blown Nova run at the track?
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Old 15-11-2012, 07:01 PM
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Do your own research Jimbo..
I've had many big blocks in many configurations since '88 with both mech and electric pumps(2 elec only)and have never had a drama with either.............research enough for me.Can you say the same?

The first electric pump I bought(Mallory)was only because I let some "you 'gotta have an electric pump" zealot convince me that I need it
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Old 15-11-2012, 07:12 PM
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Can you say the same?
Didn't I already say that I tried several mechanical pumps?
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