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Unread 08-24-2011   #1 (permalink)
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Default Fuel Pump Upgrades

Hey everybody,

So I know that this is a common question in our world but I have looked around alot and never found a straight answer with any numbers behind it.

When does one need to upgrade to a Walbro 255lph HP and is that even an upgrade?

I have a 84 SVO, which has the dual pump setup. The intank pump is a lifter and the inline is the pressure pump. Now I have done a good amount of work to my engine and have had some people, who I would consider knowledgable, estimate it at 400whp+. Now I'm not sure about that but if I make my fuel system capable of that knid of power then I have nothin to worry about.

I would also like to have the option to run E85, this is going to require more fuel for the same power but will allow me to up boost/power which will need even more fuel.

Does the dual pump setup flow more or does the Walbro 255lph HP? Lets assume that my max FP will be around 70psi or so.

I have also heard that a Walbro 255 in tank and Walbro 255HP on the rail will support upwards of 1000hp.

Anybody have some insight and numbers to clear this up?

Thanks!
Justin
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Unread 08-25-2011   #2 (permalink)
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The dual pump system is slightly better than a single 255. The 2 pump system can supply enough fuel for at least 700-800 HP. I have a single 255 in my camaro and i make well over 750 to the wheels. peace tom
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Unread 08-25-2011   #3 (permalink)
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The "dual pump" sytem you are refering to is the stock system, correct? Not 2 walbro 255lph pumps.

I also found another pump, the Aeromotive 340 Stealth Pump. This thing actually flows around 260lph....at 70psi. Suprisingly its the same size as a Walbro and only costs about $150 or so. What do you think?

My main issue is trying to decide if I should just stick with my stock dual pump setup (with stock replacement pumps) or change to the Walbro 255 or Aero340. I want to be able to run E85 so it needs to be able to keep the pressure high and flow a good bit more than it would need to on gasoline.
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Unread 08-26-2011   #4 (permalink)
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I'd recommend swapping to a later model fuel tank, from a car that had the single in-tank pump (if that's necessary-would probably be easier), and pitching the stock setup. Then you can run the single Walbro and everything will be hunky dory.
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Unread 08-26-2011   #5 (permalink)
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You will need 30% more volume with e85. That is basically not an issue with the 2 pump setup. Only issue is will it be compatible with e85??? The 255 is not e85 compatible but the aeromotive 340 is. It has a 30% more flow capacity than the 255. I never used an aeromotive pump and i do not know who makes them?? They claim they are e85 compatible. Well thats about it as far as i know the stock 2 pump system is better than a single 255. But i would say it is not E85 compatible. Good luck on your choice Peace tom
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Unread 08-26-2011   #6 (permalink)
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Quote:
Originally Posted by ghunt View Post
I'd recommend swapping to a later model fuel tank, from a car that had the single in-tank pump (if that's necessary-would probably be easier), and pitching the stock setup. Then you can run the single Walbro and everything will be hunky dory.
Just curious whats the difference what tank you use if the pump inside it is an up dated unit. (IE 255/340 ETC) ???????????????????

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Unread 08-27-2011   #7 (permalink)
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Ok thanks Tom!

I have looked and looked and it always seemed that people were back and forth on what flowed more (between the stock dual pump and a single walbro). I have read/heard that the Walbro255 is not recommended for e85 but that doesnt stop alot of people. Also was aware that the Aeromotive 340 was e85 safe.

With the better flow, and the fact that it is claimed to be e85 safe Ill probably go with the Aeromotive. For $150 bucks its actually going to be right about the same price (if not cheaper) than the two stock pumps and even though the 255 might be the cheapest option I dont want to see $100 bucks go down the drain because it really isnt e85 safe.

To ghunt: I had the same question as Tom. I have heard somewhere that the walbro are not a direct fit on the intank assembly for the 84 and that sometimes people take the assembly from a later model to put into my tank so that they can run a 255, is this what you were getting at?
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Unread 08-30-2011   #8 (permalink)
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If that's all that's needed, yes. I didn't know if you could use the later model pump bracket on the older tank. For example if you convert an older carbureted car to fuel injection, I heard that you do have to swap fuel tanks for that. So that's what I'm wondering, because that may be the reason for the dual pump setup- the SVO's still used the fuel tank from a carbureted car, hence the lift pump in the tank and pressure pump under the car.
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Unread 08-30-2011   #9 (permalink)
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Quote:
Originally Posted by ghunt View Post
If that's all that's needed, yes. I didn't know if you could use the later model pump bracket on the older tank. For example if you convert an older carbureted car to fuel injection, I heard that you do have to swap fuel tanks for that. So that's what I'm wondering, because that may be the reason for the dual pump setup- the SVO's still used the fuel tank from a carbureted car, hence the lift pump in the tank and pressure pump under the car.

You are getting yourself deeper and deeper in confusion and i would stop and think what you said. The 2 pump system in the SVO already has an in tank pump. That is a simple thing to replace it with a 255. They are the same physical size if i am not mistaken. Been a long time. NAVY is the pro on the SVO and i think he will confirm that the 2 pump system is as good or better than a single 255. With that said i am not 100% but both the 2 pump system and the 255 ARE NOT GOOD FOR E85 but the 340 is according to the manufacturer.Peace Tom
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Unread 08-31-2011   #10 (permalink)
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No...he said the in tank pump was merely a lift pump (low pressure) and the external inline pump was the pressure pump. I don't know how much different physically the lift pump is vs. a late model high volume, high pressure in-tank pump.
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