Just wondering if this wouldn't be a good idea to do away with my loud annoying elec pump ( Holley) that I have now? What kinda pressures do they put out? Don't know if it would kill the life of the pump to regulate it down?
no you can put a regulator on it if it is a holley blue or red and set it at whatever you need .it has a byp*** and just does that when the pres is reached. if you mean an injection in tank? i dont think you can it is too much prees for that... ?? f
if your going to use a pump off an EFI engine, i would think that a pump from a chevy throttle body injection system would be best, as those pumps only run @ like 14psi to start, instead of the newer style pumps that can crank out 60 psi+
If the low pressure stuff is only 14 psi as mentioned above,I have some Carlisle return style regulators for sale that used with the holley pump tend to make them quieter,even when they are solidly mounted. http://www.jalopyjournal.com/forum/showthread.php?t=84237 I don't know if you could dump enough pressure from a 35+ psi pump with them or not,maybe with a full 1/2" return you could. Mounting a holley pump on good insulators,the little 2 male stud ones makes them a lot quieter also.
The reason I ask is that I have yet to find an external "universal" fuel pump that is quiet. I just know that the later styled in-tank pumps put out more pressure and are virtually silent. If I could find an external mount pump that is quiet, I would do that......
i agree but run a return line at least 5/16 dia....and a regulator. they'll put out around 35 psi dead-headed....
I guess I could run a return if the tank could be adapted to do that...... The Holley I have is mounted in rubber....it's still too loud.
What kinda regulator would ya use? So what do ya'll think about it short cycling the life of the pump? Would it know any different if it were going back to the tank?
I have an 83 Buick Starfire (Chevy Monza look alike) 3.8 liter v6 Carb car had a pump mounted in the gas tank. Believe a lot of GM's around that year had carbs and tank mounted pumps.
One of these. http://www.jalopyjournal.com/forum/...ead.php?t=84237 and just return to the suction side of the pump,you don't have to go to the tank.That is how I have my 32 set up with the big holley Pump.
Sounds like time to experiment with the pump in the tank. Ive been considering several of the correct shaped plastic ones in boneyards for various projects including a F100. I brought a few home but havent pulled the innards yet. Seems the s**** oriented boneyards around here are pretty much giving plastic tanks away. So here are a few ideas; I have no idea if they are even possible. 1. drill a hole in the pickup in the tank to limit pressure to something a standard regulator can handle 2. Install some sort of pressure relief valve in the tank at the outlet of the pump. Lets hear some ideas, mine are outside and its 10 degrees today, they arent moving for awhile.
Thanks Tim. I'll hafta study this a bit more. Did they make an external mount pump for some of the TBI cars? I was thinking some of the smaller cars had it.
AFAIK Vegas and the like were the first GM car with an intank pump...and they ALL had carbs! "Hotrodsnguns" just might be onto something... Would a Vega pump feed your engine? I imagine it would, but might have to work a little harder. I wonder did the V8 Monzas still use an electric or did they use the mechanical SBC pump?
I've built six V8 S-10's using the in tank pump with a return type regulator. Three Carb'd and Three TBI trucks. All converted to Q-jets. You can add the TBI pump right onto your shortend pickup. Make a brace for it so it doesn't vibrate and twist all over, then make a hole for the wires and dab a litle fuel safe sealant around them and Wah La. The return type is used so that you DON'T burn up the pump. Deadheading a pump is far worse than letting it flow back to the tank/pump return. Back to the tank is better since it geves the fuel a chance to cool off before going back to the pump. I'm sure you could modify a newer pick up to fit or just add another AN fitting to your tank and call it done. I've been using Coompe***ion Engineering regulators but may switch to this Carlisle one to see how well it works.
yup, i've run v-8 s10's with the stock in tank pump too, no problem on a fairly mild motor, i was up to about 450 hp and i think that was about the limit of the stock pump. though now, in my fast car, i dig the sound of an aeromotive A1000 humming away, letting me know audibly that it's ready to pump enough fuel to feed most any monster!
Late eighties early nineties ford trucks used a lift pump in the tank to go to the pressure pump on the frame. I have seen them used to put a carb on Mustang GTs. Jay
Root- I know exactly what you mean, in the coupe it sounds like a pack of woodpeckers trying to get outta my trunk! If you figure out a nice quiet pump, would ya let a brutha know? Skip
It's mostly been said, but look for a pump that was originally used on a TBI/CFI setup - those typically run lower pressures, in the 14-18psi range. Nearly all modern in-tank EFI pumps run 40-60psi. There were a few models, mostly full-size trucks, that ran inline pumps instead of being in-tank. Look for something made in the '83-93 year models. Not sure how much power they can support, but it may actually be quite a bit. And you can increase their output by upping the voltage to them. If you want an aftermarket pump that will have AN fittings and not require a return, you might contact Aeromotive. I know they have inline pumps, and I seem to remember them offering a quieter, more streetable high output pump. Running a return may be a good idea for increasing electric fuel pump life. They don't like working against a deadhead regulator.
aeromotive = long $$$$$$$$$$$ The Ford pickups do use inline pumps under the drivers feet,but no idea of the output pressure.The tbi pumps sound like a pretty slick idea possibly.
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