How many guys run 2-3 fuel pumps all the same time
they're all fed from 12v. 
01-03-2014, 05:08 AM
#45
9 Second Club
When you live in AZ. like I do and your fuel is all ready at 115+ any little bit helps...lol
And if you were running 7 pumps like your example and based on your two pump test...They would add 14 degrees to the fuel temp which would continue to increase the longer the pumps were running.
And if you were running 7 pumps like your example and based on your two pump test...They would add 14 degrees to the fuel temp which would continue to increase the longer the pumps were running.
Even if you ran a pump system that imparted zero heat to the fuel, there is still that huge heat source heating the fuel at your engine. Where most of the heat comes from anyway.
I could sit for hours with my fuel pumps running, engine off and I'd be 99% sure I'd see no appreciable rise in fuel temperature.
I know for a fact that if I do the same with the engine running, the fuel gets warmer as the engine heats it.
The only ways to prevent this are either a fuel cooler, or never to re-circulate hot fuel back into the tank.
ie run a dead end system as many OEM's now do. So all fuel gets consumed by the engine before it has much chance of getting heated. Other than the initial warm start previously mentioned where the OEM force a purge of the fuel during such starts and initial running.
01-03-2014, 07:45 AM
#46
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Yes either dead head the fuel supply like mentioned or a fuel cooler like stated. But for guys who want to run. Twin pumps you can use a hobbs which rarely fails unless u buy a walmart brand junk bullshit one. Literally being a industrial part they will outlast lives of engines. Ask me on that I know lol
I used to run twins all the time on my nitrus setup but didnt cruise more than 30 miles tound trip. This setup is boosted and will travel more than 50 miles in one shot.
So I want to know is it safe or not?. If not then I will add the hobbs and be done with it.
I used to run twins all the time on my nitrus setup but didnt cruise more than 30 miles tound trip. This setup is boosted and will travel more than 50 miles in one shot.
So I want to know is it safe or not?. If not then I will add the hobbs and be done with it.
01-03-2014, 08:23 AM
#48
i run em hot all the time in my cars, drive to the track, blast some passes, drive home lol
might not be perfect, ideal, or the best way. but that's the way i do it and it works for me.
fuel coolers and checking fuel temp vs power would be a neat experiment, i know after 25 dyno pulls in a row on some cars i have not had trouble with power falling off.
might not be perfect, ideal, or the best way. but that's the way i do it and it works for me.
fuel coolers and checking fuel temp vs power would be a neat experiment, i know after 25 dyno pulls in a row on some cars i have not had trouble with power falling off.
01-03-2014, 08:36 AM
#49
I wouldn't say it is the consensus, maybe the consensus of those that posted here.
But I would agree with MightyMouse, over the "consensus" here.
MightyMouse is a reliable source of good "real world" experience/information.
In my own experience...
We have been running multi-pump setups, with Hobbs switches, in the TurboRegal world since the beginning of time, with very little problems.
This year on DragWeek there were a lot of "vapor lock" and over heated fuel issues, mainly because of people trying to run a larger fuel pump on the street, a twin pump setup(like we run) usually doesn't have any of those issues.
Some fuel tanks were so hot you could not touch them.
Our old turbo Fairmont had jumo one external 255 pump, and 22 volt voltage booster(msd boost a pump) and it would make the fuel hot to the touch after five or six 1/4 mile runs.
If you run a mutli-pump system, don't leave the second pump on all the time....
But I would agree with MightyMouse, over the "consensus" here.
MightyMouse is a reliable source of good "real world" experience/information.
In my own experience...
We have been running multi-pump setups, with Hobbs switches, in the TurboRegal world since the beginning of time, with very little problems.
This year on DragWeek there were a lot of "vapor lock" and over heated fuel issues, mainly because of people trying to run a larger fuel pump on the street, a twin pump setup(like we run) usually doesn't have any of those issues.
Some fuel tanks were so hot you could not touch them.
Our old turbo Fairmont had jumo one external 255 pump, and 22 volt voltage booster(msd boost a pump) and it would make the fuel hot to the touch after five or six 1/4 mile runs.
If you run a mutli-pump system, don't leave the second pump on all the time....
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01-03-2014, 09:59 AM
#51
9 Second Club
Yes either dead head the fuel supply like mentioned or a fuel cooler like stated. But for guys who want to run. Twin pumps you can use a hobbs which rarely fails unless u buy a walmart brand junk bullshit one. Literally being a industrial part they will outlast lives of engines. Ask me on that I know lol
I used to run twins all the time on my nitrus setup but didnt cruise more than 30 miles tound trip. This setup is boosted and will travel more than 50 miles in one shot.
So I want to know is it safe or not?. If not then I will add the hobbs and be done with it.
I used to run twins all the time on my nitrus setup but didnt cruise more than 30 miles tound trip. This setup is boosted and will travel more than 50 miles in one shot.
So I want to know is it safe or not?. If not then I will add the hobbs and be done with it.
Although it's been a while since Ive been at a proper drag strip, that's the furthest I usually travel in the car, and that's roughly 500 miles each way, with about 450 of that being done in a single journey usually.
Absolutely a hobbs switch does work. But there really is almost no benefit whatsoever to running that way
01-03-2014, 06:26 PM
#55
9 Second Club
