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The relay will get hot. Feel some of the relays in the box after 20mins of running they will be hot. You should be able to hold it in your hand issue free but it will be warm
late 2004-2008/9 custom efi AN setup
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20,332 Posts
I believe the current pull is around 14amps at 70psi. 40a relay should not be getting hot.
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19,725 Posts
Drive the truck around town and do one test hit at 14psi boost. Raising up the fuel pressure from 50psi to 56psi @ 14psi boost. The relay gets hot and then when I let the truck idle in my driveway. It drops 2psi fuel pressure.
It still seems to be linked to the drop in battery voltage at idle. Going to replaced the battery and one step up alternator. Remember, it runs extra stuff now. Radiator electric fan, w/m system, water pump and fan for the intercooler system, and various gauges. Need to get the voltage steady. The pcm/tune works better with steady voltage. Believe it's also time to update the fuel lines, fuel filter, and fuel rails to make the fuel pump not work as hard.
It still seems to be linked to the drop in battery voltage at idle. Going to replaced the battery and one step up alternator. Remember, it runs extra stuff now. Radiator electric fan, w/m system, water pump and fan for the intercooler system, and various gauges. Need to get the voltage steady. The pcm/tune works better with steady voltage. Believe it's also time to update the fuel lines, fuel filter, and fuel rails to make the fuel pump not work as hard.
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18,195 Posts
The relay will get warm/hot every single car does I do this all day thy will get warm/hot. ANthe entire setup from the tank to the rails I have been using -6 for years issue free and will be going to -8 when I do the fuel cell soon enough!
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As you have said getting the voltage steady is the key. Pressure drop at idle is an indicator that your idle is too low, faulty battery or inadequate wiring to the pump. With that said, you have to decide whether its an issue or not. I believe it isn't, as long as the pressure is steady during normal or wot driving. Like you indicated some of our trucks have extra load put on them from added accessories. Even with a relatively high idle and a over driven alternator i can certainly tell as various fans/pumps cycle on/off. I try to put a overnite charge on her once a week or so. But think about it, does it matter that your idle pressure is a couple pounds low?
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Yes, it does. The pcm isn't happy after a 14psi test hit. Normally, it will idle rough and the pcm will adjust back to the original settings and all is good. Add in 2psi lower fuel pressure and she's pissed off running very rough and very lean at idle. That's why I have to get this fuel pressure problem straightened out.
The only reason why I'm going this far with it. She runs AWESOME at 14psi boost.
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Having been there I know first hand the 03 pcm limitations. Its simply beyond the pcm's ability to manage a performance package. Whether it be a mild cam on boost or a bigger cam na. It simply isnt going to be tunable. I have a stack of 03 pcm's unfortunately to prove it. You will only get a taste of your engines potential as long as you stay with the stock pcm.
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19,725 Posts
If I can get this fuel pressure drop problem fixed. As strong as she's running at 14psi boost. Should be back into the 12s.
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18,195 Posts
2 psi should not be giving you an issue. Setthe truck to run low boost and drive the thing move on to the 2005 and have some damn fun. My fuel guage reads off by a few psi daily so if your going by an aftermarket guage would not trustit to be 100% anyway. Wall and head gotta stop meeting break thru and spread your wings!
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The plan here is to go ahead and do a complete updated fuel system on the 03. If it works and stabilizes the fuel pressure, cool! It would be easy to switch it over to the 05. :thumb:
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20,332 Posts
Thats why i love our old trucks, we can do whatever strikes our fancy regardless if it makes sense to anyone else..
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8,765 Posts
ld-025: :exactly:
This is a very old post there are better modules out there to start with. here is one that I use for my mod.
Electric Fuel Pump Module Fits Dodge Ram 3500 Ram 2500 2005 2006 2007 L6 5.9L | eBay
The Following Are Applicable Models Drive Type Electrical Fuel Type Gas PSI 15-30 Gallons Per Hour (GPH) 75-90 Placement on Vehicle Rear Please Confirm Short Bed Outlet Type Quick Connect Outlet Size 3/8 Inlet Type Strainer Inlet quantity 1 Outlet quantity 1 Internal Or External Strainer...
www.ebay.com
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18,195 Posts
Little update to the fuel pump in tank. Holly has these little guys now. 255-400lph pumps. This is a drop in for Dodge Ram trucks for sure good to 2005.
www.holley.com
Holley 12-320 Holley 255 LPH Pump Module - Returnless
Update the fuel system in your Dodge truck with a high performance in-tank EFI fuel pump module. These fuel modules fit inside the factory tank & feature a billet aluminum flange, Hydramat®, fuel sending unit, and high performance pump. Choose from 255 or 450 LPH (liters per hour) fuel flow &...
www.holley.com
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