Hi-flow fuel pump install question

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Feb 19, 2010 | 07:32 PM

Big_Red_Brute

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Tuned

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From: Virginia

Hi-flow fuel pump install question

Alright, I've installed a built motor into my 1990 F-150 and because of that I've bumped up my injector size to 24# from the stock 19#. I purchased a kit that included Ford Racing injectors and a new 155 lph fuel pump. Problem is, the pump is actually for a Mustang, not an F-150, and I'm having problems installing it. The pump will not fit in the factory "module". I've been told to use a 1987-93 Mustang hanger assembly, but the Mustang used a seperate insert for the float assembly. Has anyone ever installed a high flow fuel pump in a fuel injected F-150, and if so, how did you install it?

Feb 19, 2010 | 09:07 PM

Conanski

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From: Ottawa, Ontario

How "built" is this motor?

FYI..The stock EFI system in this truck won't work with larger injectors you need a mass air system for that, but depending how much better than stock the motor is you may not even need either.

I have installed a high flow pump in the truck fuel sennding resovoir, but I had to buy several before I found one that would fit without too much modification. The one that did fit with minor changes was a 155l/hr Carter.

Feb 19, 2010 | 10:14 PM

Big_Red_Brute

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Tuned

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From: Virginia

The motor is a 302 HO from a 1990 Mustang, bored .040 over, balanced to 28 oz., 10:1 compression ratio, fully roller valvetrain, E303 cam, ported/polished/3 angle valve job on production heads, and some other minor modifications as well. I'm already in the process of converting to a mass air system on the truck for the very reason you have mentioned. The pump that came with the kit was a Walbro pump, which was a OEM supplier from my understanding. I also have dug up some other information that I found interesting. According to my research, 155 lph is equal to 41 gph, and a stock replacement pump is rated at 50-60 gph. So in theory here, wouldn't a stock replacement pump be enough to feed the 24# injectors? And one more thing I forgot to add, I did install an adjustable pressure regulator on the fuel rail before I re-installed it.

Feb 20, 2010 | 09:48 AM

shuttlevalve

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Didnt ford bump up the fuel pumps on the latter 95ish trucks to like 95gph?? I thought i read that somewhere or maybe it was when ford Racing offered the supercharger kit you needed the later fuel pumps to supply enough fuel.

Feb 20, 2010 | 11:40 AM

Conanski

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From: Ottawa, Ontario

The highest rated replacement pump I have seen for these trucks was 60gal/hr but I don't think the original pumps were anywhere near that big. For reference a 255l/hr pump is only 67gal/hr and that will supply 500hp or more.

Feb 20, 2010 | 11:44 AM

Conanski

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From: Ottawa, Ontario

Quote:

Originally Posted by Big_Red_Brute

Should be a good combo, a "calibrated" 24lb MAF meter will work reasonably well until you decide to add a tuner to the system. I'm guessing you have already planned for some steep gears to turn those 38" tires?

Feb 20, 2010 | 07:02 PM

Big_Red_Brute

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Tuned

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From: Virginia

Quote:

Originally Posted by Conanski

So to make sure I'm hearing you right. You're saying that the stock replacement pump I found on Auto Zone's website that claimed 50-60 gph would be enough to push 24# injectors, which would mean my theory was correct.
As for your comments on the motor, I think it should be a killer set-up myself. I bought it off a friend of mine who had only put 500 miles on it since it was re-built for $1000, after he found a deal on a 408 stroker for his 'Stang. As far as gears go, I'm running 4.56's with an AOD tranny. It doesn't sound very tall, but this was the set-up I was advised to go with due to the overdrive tranny.