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post #1 of 16 (permalink) Old 04-27-2019, 06:25 PM Thread Starter
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Walbro fuel pump question

Hey guys, quick question. How's everyone's luck with the walbro gsl392 pump?

When I rebuilt my trans I decided I would add a fuel pressure gauge and found the issue as to why it looses so much power in the top end. I have a stock (new) bosch pump but it's just not keeping up with the 180/0 injectors and Jody's tunes. Nor will it go above 50 psi at idle. It seems the walbro flows more but I need something where I can get at least 60 psi at idle, my injectors idle smooth and perfect right there. Any thoughts or suggestions?
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post #2 of 16 (permalink) Old 04-27-2019, 06:45 PM
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Re: Walbro fuel pump question

I would go with the AEM400lph from CNC Fab. Walbro will not stand behind the pump warranty if used with diesel where as AEM will. Another thing to consider would be either the 4 line feed from cnc fab or the FRX from riff raff. It helps balance the fuel flow to all corners of the heads and will kill the factory dead head.

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FF 205/30's, KC 300X 63/73 .84, South Bend Clutch, CNC Fab 4 Line Feed, AEM 400LPH, PHP Tuned
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post #3 of 16 (permalink) Old 04-27-2019, 08:55 PM Thread Starter
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I do have the frx, never liked the 4 line feed idea, it doesn't abate the deadhead issue. I looked on cnc fab's website and it doesn't say anything about using this pump with diesel. Do you have bigger injectors and use this pump?
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post #4 of 16 (permalink) Old 04-27-2019, 09:25 PM
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I plan to try the AEM can't find much bad about them . walbro better carry a spare and be ready from 6 months to a year old to replace it .

thats my educated conclusion from studying them . I will be using the AEM on stock for a month or so tell I can get 238/80 injectors
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post #5 of 16 (permalink) Old 04-27-2019, 10:51 PM Thread Starter
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Well... looks like I'll give it a shot then. I am avoiding a $500+ fuel system that I dont need for stage 1's but oreilly pumps are just not cutting it, unless I wanna change it every 8 months to a year and only be able to run my stock tune.
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post #6 of 16 (permalink) Old 04-30-2019, 02:18 PM
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Re: Walbro fuel pump question

Why not just use an OEM hfcm from a 6.7? Under 150.00 and OEM reliability. 80-120 psi all day long.
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post #7 of 16 (permalink) Old 05-01-2019, 12:27 PM
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Re: Walbro fuel pump question

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Originally Posted by TDtech1 View Post
I do have the frx, never liked the 4 line feed idea, it doesn't abate the deadhead issue. I looked on cnc fab's website and it doesn't say anything about using this pump with diesel. Do you have bigger injectors and use this pump?
It actually does take care of dead head....and it does it better then the frx. Not trying to start an argument but corey has used that 4 line feed on 450/400s with no issues. It says right on his website it takes care of the #1 and #8 fuel starvation. I am running 205/30's and have no issues holding fuel pressure on my set up.

2002 F-250 ECSB ZF6
FF 205/30's, KC 300X 63/73 .84, South Bend Clutch, CNC Fab 4 Line Feed, AEM 400LPH, PHP Tuned
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post #8 of 16 (permalink) Old 05-02-2019, 05:53 PM Thread Starter
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I've never looked into mounting an hfcm didnt know of its existence until now lol. Already have the Aem pump on it's way so I'll run with that unless it wont keep up. I've been running a precision pump from oreillys with no issues other than every year to the day, it will crap out but it had a lifetime warranty. Precision, then changed their design and they are garbage now, barely holds 50 psi at idle and dumps to 20 or 30 at WOT on my stock tune. Same with autozone pumps. I just tried a "standard motor products" pump from oreillys and was surprised and excited to see a bosch pump in the box. But was immediately disappointed when I saw the overall output. It must have been a knock off. The AEM will be put in this weekend tho. Crossing my fingers it does its job as well as advertised. Everytime I fix one problem on this truck, i find another.
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post #9 of 16 (permalink) Old 05-03-2019, 06:21 AM Thread Starter
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Got the AEM pump a day early and it is a bigger diameter than the knock off bosch and the original precision pump design, bigger inlet and outlet connections and heavier also. It wont fit into the stock fuel pump bracket, if I keep the isolator pad. Had to go get fittings to adapt to 3/8 barbs and all I needed was 1 foot of 3/8 fuel hose to make it a painless install but, stretching the garbage stock plastic hose will work for now. With my 180/0 injectors at idle I get 60-70 psi at WOT on Jody's 140 hp race tune, it drops to 50 psi. Definitely glad I went this route with the pump.
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post #10 of 16 (permalink) Old 05-03-2019, 01:49 PM
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Re: Walbro fuel pump question

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Originally Posted by TDtech1 View Post
Got the AEM pump a day early and it is a bigger diameter than the knock off bosch and the original precision pump design, bigger inlet and outlet connections and heavier also. It wont fit into the stock fuel pump bracket, if I keep the isolator pad. Had to go get fittings to adapt to 3/8 barbs and all I needed was 1 foot of 3/8 fuel hose to make it a painless install but, stretching the garbage stock plastic hose will work for now. With my 180/0 injectors at idle I get 60-70 psi at WOT on Jody's 140 hp race tune, it drops to 50 psi. Definitely glad I went this route with the pump.
Did you not want to try and actual Bosch stock SD pump? I got mine on Amazon for around $100, and it works great. I even bought a spare just in case, and eventually will run dual pumps.

I see your from Tulare as well, I'm in your neighboring city in Visalia


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