Fuel problems - Dodge Cummins Diesel Forum
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

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post #1 of 23 (permalink) Old 08-20-2019, 01:08 AM Thread Starter
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Okay so I recently purchased a 1999 Dodge Ram 3500 4x4 I bought it in Ohio I live in Florida I travel a lot and bought a big truck for a camper SO I know little about diesels but I’m haveing fuel issues I’m supposing I’m trying to fix it before I leave from Florida to Cali when I bought the truck and drove it to FL it did fine fuel pressure stayed between 14-16 psi well when I was heading to Cali I got about 4 hours in and my fuel pressure dropped to 0-3 so I pulled over and someone at Napa told me my fuel pump was bad in the tank so I replaced that that fixed nothing new filters on my FASS 150 still nothing replaced the FASS 150 pump it’s doing better 21-16 in park but when I drive it fluctuates 16psi down to 3psi when I accelerate, I have no idea what to do & it has the juice with attitude that’s how I monitor it.

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post #2 of 23 (permalink) Old 08-20-2019, 01:32 AM
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What setting is the jwa on? Maybe the fuel pressure relief valve or fp sending unit? I'm assuming since you said you replaced a pump in the tank it has a pusher pump not the puller Carter and filter any longer correct?

2012 2500 QCSB/Built 6.8L/48RE Swap/Gated Shifter
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post #3 of 23 (permalink) Old 08-20-2019, 01:33 AM
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Do you still have your factory filter up on the block?
Some installers delete it, some keep it.
I still have mine. So i replace that filter as well.
And i have seen crud get to it also.
Which, the crud isnt your fuel issue, i just threw that bit in for free.

2001 2500 5spd, 4" straight pipe, fass titanium series, mach1.6 injectors, CAI, adrenaline, southbend dual-friction, 2011 fto wheels
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post #4 of 23 (permalink) Old 08-20-2019, 01:34 AM
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Wait....you said you have a FASS ..AND...inTank pump? That dont add up.

2001 2500 5spd, 4" straight pipe, fass titanium series, mach1.6 injectors, CAI, adrenaline, southbend dual-friction, 2011 fto wheels
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post #5 of 23 (permalink) Old 08-20-2019, 01:37 AM Thread Starter
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Completely bypassed from stock has the pump in the tank to the lift pump on the frame & I run the jwa on mileage
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post #6 of 23 (permalink) Old 08-20-2019, 01:39 AM Thread Starter
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It has the fuel pump in the tank & then it it goes to the FASS 150 lift pump bypasses the block filter and pump lift on the block
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post #7 of 23 (permalink) Old 08-20-2019, 01:39 AM Thread Starter
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How do I post photos or can I put my number on here?
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post #8 of 23 (permalink) Old 08-20-2019, 01:40 AM
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Quote:
Originally Posted by mykeb View Post
Wait....you said you have a FASS ..AND...inTank pump? That dont add up.
I caught that too. Possibly his issue?

2012 2500 QCSB/Built 6.8L/48RE Swap/Gated Shifter
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post #9 of 23 (permalink) Old 08-20-2019, 01:40 AM
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Photobucket if you upgraded when they went all nazi, I use tapatalk on some other forums

2012 2500 QCSB/Built 6.8L/48RE Swap/Gated Shifter
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post #10 of 23 (permalink) Old 08-20-2019, 02:03 AM Thread Starter
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Old fuel pump in the tank it has a new one now


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post #11 of 23 (permalink) Old 08-20-2019, 02:05 AM Thread Starter
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Lift pump FASS 150


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post #12 of 23 (permalink) Old 08-20-2019, 02:08 AM Thread Starter
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Completely bypassed


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