PWM a fuel pump
Thread Starter
Joined: Dec 2018
Posts: 446
Likes: 81
From: Midwestern Illinois
PWM a fuel pump Looking for enough fuel pump to run 500 fwhp on e85. 5.3, vortech s trim, deka 80's. I really don't want to get into trying to PWM a pump. Ideas? I'm using holley terminator, and this is just a street car, lots and lots of driving.
TECH Addict
Joined: Dec 2004
Posts: 2,178
Likes: 627
From: Florida
I made about 530 to the hubs with a hellcat 525 with no check valve.
my setup has the pump in about the worst possible config. Its about 25’ of all -6an since I’m using the stock tank in a station wagon.
plus I’m pretty sure it was making a lot more at the crank since it only made 598 at 19 psi and similar combos are making 1-200hp more with manual trans instead of loose th400 but your mileage may vary.
for just 500whp it’s plenty of pump and used in oem applications.
my setup has the pump in about the worst possible config. Its about 25’ of all -6an since I’m using the stock tank in a station wagon.
plus I’m pretty sure it was making a lot more at the crank since it only made 598 at 19 psi and similar combos are making 1-200hp more with manual trans instead of loose th400 but your mileage may vary.
for just 500whp it’s plenty of pump and used in oem applications.
FWIW I ran a single AEM400 and 80’s and made 560/600 whp on a -8 feed. If 500 is all you want. A single AEM400 will do it. Just be sure to isolate the the pump with a rubber mount and use rubber isolators. Otherwise, they can be pretty noisy. Also be sure the pump i getting full voltage to redline. A lot of the factory alternators w stock pulleys ratios cut out around 6k. The pump needs 13v+ to flow well.
Then you can always add a second pump down the road if you want.
Then you can always add a second pump down the road if you want.
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TECH Addict
Joined: Dec 2004
Posts: 2,178
Likes: 627
From: Florida
i think you can run just about any fuel pump submerged in fuel if you want to. fuel has a very very high dielectric strength so theres nothing special about an 'in-tank' pump that im aware of except maybe a lack of mounts.
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Verdad Gallardo Yea the AEM's can be submerged. Just a pain to change them out. Summit or many others sell the "sock" to drop it in the tank. They def run a little cooler that way!
https://www.summitracing.com/parts/a...waAoMLEALw_wcB
https://www.summitracing.com/parts/a...waAoMLEALw_wcB
Thread Starter
Joined: Dec 2018
Posts: 446
Likes: 81
From: Midwestern Illinois
That AEM pump looks like a good fit. I'm used to race orientated builds so the daily driver build just seems more difficult. I'm thinking a lot more in terms of longevity and noise reduction, all along with making it work.
I made about 530 to the hubs with a hellcat 525 with no check valve.
my setup has the pump in about the worst possible config. Its about 25’ of all -6an since I’m using the stock tank in a station wagon.
plus I’m pretty sure it was making a lot more at the crank since it only made 598 at 19 psi and similar combos are making 1-200hp more with manual trans instead of loose th400 but your mileage may vary.
for just 500whp it’s plenty of pump and used in oem applications.
my setup has the pump in about the worst possible config. Its about 25’ of all -6an since I’m using the stock tank in a station wagon.
plus I’m pretty sure it was making a lot more at the crank since it only made 598 at 19 psi and similar combos are making 1-200hp more with manual trans instead of loose th400 but your mileage may vary.
for just 500whp it’s plenty of pump and used in oem applications.
I ended up putting a smaller primary pump for driving around and a 525 hellcat pump as my secondary that kicks on at 1psi. It does much better now.
On The Tree
Joined: Feb 2022
Posts: 196
Likes: 72
From: Grand Rapids, MI
Yes, the car gets driven all over the place. Been on several 3 hours trips with it. I don't catch a lot of heavy traffic.
I do understand why OEMs PWM them, but I personally have not had any issues.
I feel like you and I have discussed this before lol.
I did have a problem when in very slow traffic on a hot day I would vapor lock. This was because my fuel lines were too close(within 5 inches, sometime closer) to my exhaust for like 5 feet. Combine that with hot pavement, soaring underhood temps of third gens and fuel was boiling. Moved fuel lines and no more problems. I do not think the pump had anything to do with this.
I would rather have a setup like you have with a small pump for cruising a big boy that comes on with boost or throttle. But I have a third gen and stuffing 2 pumps into the small tank opening is hard, so I went the lazy route and just plopped the 525 in place of the factory one.
I do understand why OEMs PWM them, but I personally have not had any issues.
I feel like you and I have discussed this before lol.
I did have a problem when in very slow traffic on a hot day I would vapor lock. This was because my fuel lines were too close(within 5 inches, sometime closer) to my exhaust for like 5 feet. Combine that with hot pavement, soaring underhood temps of third gens and fuel was boiling. Moved fuel lines and no more problems. I do not think the pump had anything to do with this.
I would rather have a setup like you have with a small pump for cruising a big boy that comes on with boost or throttle. But I have a third gen and stuffing 2 pumps into the small tank opening is hard, so I went the lazy route and just plopped the 525 in place of the factory one.
Yes, the car gets driven all over the place. Been on several 3 hours trips with it. I don't catch a lot of heavy traffic.
I do understand why OEMs PWM them, but I personally have not had any issues.
I feel like you and I have discussed this before lol.
I did have a problem when in very slow traffic on a hot day I would vapor lock. This was because my fuel lines were too close(within 5 inches, sometime closer) to my exhaust for like 5 feet. Combine that with hot pavement, soaring underhood temps of third gens and fuel was boiling. Moved fuel lines and no more problems. I do not think the pump had anything to do with this.
I would rather have a setup like you have with a small pump for cruising a big boy that comes on with boost or throttle. But I have a third gen and stuffing 2 pumps into the small tank opening is hard, so I went the lazy route and just plopped the 525 in place of the factory one.
I do understand why OEMs PWM them, but I personally have not had any issues.
I feel like you and I have discussed this before lol.
I did have a problem when in very slow traffic on a hot day I would vapor lock. This was because my fuel lines were too close(within 5 inches, sometime closer) to my exhaust for like 5 feet. Combine that with hot pavement, soaring underhood temps of third gens and fuel was boiling. Moved fuel lines and no more problems. I do not think the pump had anything to do with this.
I would rather have a setup like you have with a small pump for cruising a big boy that comes on with boost or throttle. But I have a third gen and stuffing 2 pumps into the small tank opening is hard, so I went the lazy route and just plopped the 525 in place of the factory one.
gotcha. I guess if you aren’t having issues, then leave it be. But if you do, maybe look into a pwm controller.
I had been told that the Hellcat PWM controls the pump because it uses a returnless style fuel system, so they need to turn the pump down to cut down on heat.
If used in a properly sized return style system, I've heard the 525 can be run constant duty because the return style system imparts less heat on the pump.
Not sure how true this is but it does make sense.
If used in a properly sized return style system, I've heard the 525 can be run constant duty because the return style system imparts less heat on the pump.
Not sure how true this is but it does make sense.
I had been told that the Hellcat PWM controls the pump because it uses a returnless style fuel system, so they need to turn the pump down to cut down on heat.
If used in a properly sized return style system, I've heard the 525 can be run constant duty because the return style system imparts less heat on the pump.
Not sure how true this is but it does make sense.
If used in a properly sized return style system, I've heard the 525 can be run constant duty because the return style system imparts less heat on the pump.
Not sure how true this is but it does make sense.
