Fuel Pressure. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 12-19-2010, 10:08 PM Thread Starter
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Fuel Pressure.

I was drivin a buddies 99 24 valve over the week and noticed his fuel pressre gauge on both his pillar and edge cts was showing about 30 psi at idle. Does this sound right?

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post #2 of 10 (permalink) Old 12-19-2010, 11:26 PM
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ShoUld be about 15psi at idle and not under 10-12 at WOT.

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post #3 of 10 (permalink) Old 12-20-2010, 12:48 AM Thread Starter
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Is it bad or good that it's so much more?

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post #4 of 10 (permalink) Old 12-20-2010, 02:18 AM
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30 could be a bit high, i run 25...to little your pump will starve and crack the diaphram, too much and the pressure CAN crack the diaphram, i know quite a few people that run 30+, but thats on pulling trucks that are calling for A LOT of fuel....

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post #5 of 10 (permalink) Old 12-20-2010, 02:45 AM
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What pump is he running? I would turn it down a bit if it were mine.

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post #6 of 10 (permalink) Old 12-20-2010, 02:52 AM Thread Starter
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He's running a stock SO pump. No aftermarket lift pump or injection pump. Actually, it's stock everything except for stacks gauges and a K&N filter on the end. He has the juice and CTS installed but can't run it on anything other than stock cause his tranny slips.

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post #7 of 10 (permalink) Old 12-20-2010, 03:03 AM
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He has a stock pump hitting 30? It's about to die. My stock pump ran 15 tops and barely hit 10 at WOT. That was with a 10PSI pump in the tank feeding it (long story).

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post #8 of 10 (permalink) Old 12-20-2010, 09:31 PM Thread Starter
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Yeah, it's all stock. I asked him about it and he said that it's supposed to be about 30 psi at idle and 25 psi at WOT. That's when I remember readin somethin on here about 12 at idle and 10 at WOT.

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post #9 of 10 (permalink) Old 12-30-2010, 07:59 PM Thread Starter
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So how much would it cost to replace the pump? And how big of a pain is it to replace it?

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post #10 of 10 (permalink) Old 12-30-2010, 09:19 PM
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Put an AirDog or FASS in there and be done with it. I recommend the AirDog because it's much more quiet than the FASS in my experience. You can then remove all the factory fuel housing crap and tie up the WIF and heater circuit. Go to any of the auto stores and buy a SBC fuel pump block, remove the factory bracket on the block and install the SBC block. It looks so much better.

I run my fuel pressure gauge from AirDog housing but you can still run from the banjo if you really want to.

AirDogs run $400-$500+ and it takes an hour or two depending how you do it. I pulled the bed on mine.

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