Rossco

Oh yeah fitting them under the truck is simple but you lack room for the unit and the relay.

I will probably put them in the cab. Was also gonna locate the battery there to free up space under the hood.

I understand the problems with the FPDM I just wanted an opinion on the heat they generate.

And I don't understand how I lost you with the last post? I need to use and extra FPDM to run the two pumps in tank.

JCooper

I gotcha about that as I said. This is the part I didn't understand....

" I got a triple pump fuel hat. I didn't release these units get hot."

I just had no idea what that is. That's all. The rest I'm clear on.

If you put the battery in your cab, could there be an issue with off gassing? Sounds like some very ambitious mods your talking about.

Rossco

Yeah I use semi short talk, ignorant to the fact some people don't interpret the way I see it. And this silly I-phone decides what words I think I type.

And yeah. Big plans for sure. I will get a sealed CAT battery. The advantage of running in cab is the Other add on's can be controlled from there like the electric water pump, intercooler pump and Monster fans.

It's pretty tight under the hood of the 04-08's as you probably know. Heck I had to use an aftermarket washer fluid bottle as I placed a killer chiller unit in the OEM bottle location. To fit a larger intercooler tank is pretty impossible unless you place it where the battery should be.

Anyhow: I was wondering how hot these FPDM's get? Do they need airflow to cool?

JCooper

I think they do. Another guy on here ,MGD, advised someone against plasti dipping their module because the metal back plate needs to displace heat. I'm going off of what he said. But Considering this, I'm guessing they get kinda warm. Maybe that would explain why the factory mounts them to the frame?

MGD

Hey, g'Mawnin' thar, Hoss;

Wellsir, th' ol' backplate on thet thar FPDM be metal fer a reason, ah reckon.

The design uses the backplate to dissipate heat from the power FET that does the PWM to the fuel pump. They can get warm.

Cab mounting works since it gets the thing out of that horrendous environment for us blessed salt-encrusted folks. However, I'd not put them in an enclosure for dissipation reasons. Instead, simply remove yer backseat vertical cushion and bolt them directly to the rear cab inside wall - NO standoffs. That nice hunk o' sheetmetal makes a terrific heatsink extension. Mount yer relay there too, and just run a (fused) control wire to yer preferred switch location.

When you build yer harness ensure you overengineer the wiring sizes to account for the extra length to the pump(s).

Good luck!

Oh, and Coop - this here feller be Boosted - he ain't normal. In a good way.

Rossco

Oi Oi Oi. Yeah it's a labour of love he he

I need to modify a modified modification!

I will take a real good look when I pull the box and get back to you regarding the best location and wiring.

Thanks for the heads up.

Mark H

Just joined today as result of searching for a solution to my problem. Replaced the fuel pump driver module, and it fired right up. Corroded right through. No symptoms until yesterday. Luckily I was home when it happened


Thanks again,
Mark

JCooper

That's fantastic. So your truck wouldn't start and you searched the web and found our post?

Mark H

Just that simple. Saved me a tow bill and labor cost. Thanks again!!!

JCooper

That's great, Mark. Glad we could help. That was exactly why I started this thread. Take care.