New Raptor 150, bad IP? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 36 (permalink) Old 10-28-2009, 02:00 AM Thread Starter
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New Raptor 150, bad IP?

This is for my brother, he's in San Antonio at LackLand AFB for training this week. He has a '99 CTD. We installed a new Raptor 150 from the tank to the big line kit to the IP this last weekend. Everything went smoothly and worked great. We didn't install a gauge for him to see the fuel pressure while driving, but did put one under the hood. At idle, it was steady at 18lbs. Bring the rpms up and it was steady. He left DFW and drove to SA and everything was fine. Then this morning the truck quit. It will now idle ok, but if the throttle is brought up, it coughs and sputters and threw a CEL. I am trying to find someone local to pull the codes for him. He says now the fuel pressure has dropped to about 15lbs and is fluctuating. The pump is running and doesn't sound any different than it did when we installed it. Could it be sucking air at the tank? I wasn't impressed with the snap fit connector to the factory suction line...I've got to figure out what's wrong and if I need to drag my trailer to SA and bring him back to DFW. We have to get him back on the road so he can get back to his home AFB in IL. Any thoughts?

97 F-350 Dually 5spd 4.10's Daily Driver/Tow Rig
Open air intake, open exhaust, TS 6pos chip, 1.0 ATS turbo housing, gauges

86 CUCV Blazer Rock Crawler 6.2 Diesel, 4spd, 208, locked One Tons, 5.13's, H1 12 Bolt double bead locks

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post #2 of 36 (permalink) Old 10-28-2009, 02:01 AM Thread Starter
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I forgot to add the only other mods to the truck is a TS MVP, an open WIX air filter with pre-filter and exhaust.

97 F-350 Dually 5spd 4.10's Daily Driver/Tow Rig
Open air intake, open exhaust, TS 6pos chip, 1.0 ATS turbo housing, gauges

86 CUCV Blazer Rock Crawler 6.2 Diesel, 4spd, 208, locked One Tons, 5.13's, H1 12 Bolt double bead locks

05 Dodge 3/4T Cummins/6spd (Wifes)
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post #3 of 36 (permalink) Old 10-28-2009, 02:23 AM
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Was the previous Lift pump dead?? If so it might have taken the VP44 with it, and now that you have adequate fuel pressure the VP might be showing its on it last leg.. You’re now providing enough static pressure at idle that the VP has enough life to pass though the fuel but under load it cannot deliver the needed or desired pressures….

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post #4 of 36 (permalink) Old 10-28-2009, 02:32 AM
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Quote:
Originally Posted by Snowaholic View Post
Was the previous Lift pump dead?? If so it might have taken the VP44 with it, and now that you have adequate fuel pressure the VP might be showing its on it last leg.. You’re now providing enough static pressure at idle that the VP has enough life to pass though the fuel but under load it cannot deliver the needed or desired pressures….


He is right...that is common. You said he was going to have codes pulled....What year is the truck...can he do the "key trick", by turning the key to "ignition on" 3 times, and leaving it on on the 3rd time...the codes may show up in the odometer window...some years do it, and some do not.....

Let us know as soon as you can! Good luck!

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post #5 of 36 (permalink) Old 10-28-2009, 03:04 AM Thread Starter
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I never put a gauge on the old pump, so I don't know if it was dead or not. I had him try the key trick, but it doesn't work for his truck.

97 F-350 Dually 5spd 4.10's Daily Driver/Tow Rig
Open air intake, open exhaust, TS 6pos chip, 1.0 ATS turbo housing, gauges

86 CUCV Blazer Rock Crawler 6.2 Diesel, 4spd, 208, locked One Tons, 5.13's, H1 12 Bolt double bead locks

05 Dodge 3/4T Cummins/6spd (Wifes)
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post #6 of 36 (permalink) Old 10-28-2009, 03:40 AM
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Where did you guys connect the power and ground to? The battery or the alternator? He should check all the connections for the Raptor first....also, if it was to the battery, was it to the drivers side one??

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post #7 of 36 (permalink) Old 10-28-2009, 10:32 AM Thread Starter
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I had him check all the connections first. The power is to the junction box right next to the driver side battery and the ground is to the driver side battery.

Thanks

97 F-350 Dually 5spd 4.10's Daily Driver/Tow Rig
Open air intake, open exhaust, TS 6pos chip, 1.0 ATS turbo housing, gauges

86 CUCV Blazer Rock Crawler 6.2 Diesel, 4spd, 208, locked One Tons, 5.13's, H1 12 Bolt double bead locks

05 Dodge 3/4T Cummins/6spd (Wifes)
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post #8 of 36 (permalink) Old 10-28-2009, 01:27 PM
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Ok....Man, this is no fun! Wish it was right in front of us to see and troubleshoot!

So lets see here...All his connections are good, the pump is running properly and hooked up properly. The truck will start but under any type of throttle input it will choke and die. (Just talking through this stuff...)

The fact that the fuel pressure has all the sudden dropped makes me want to check all the fittings to be sure they are tight and not sucking air somewhere. It would be possible that one of the actual fittings is a tad loose and is pulling air under any throttle input. (This is all assuming the VP is still good...) I know the connection fittings on the Raptor are good, but there is always that chance, especially right after the install, that something has worked its way loose.

Just throwing ideas out there with ya, hope its giving some direction. After all, I don't want to leave our service men stranded....I'm not the president....

My truck wants to be a semi when it grows up...
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post #9 of 36 (permalink) Old 10-28-2009, 01:37 PM Thread Starter
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I do appreciate all the help and ideas and so does he! Someone has to stand behind our troops, we know the pres. won't...

He gets out of class this morning and I told him to re-check all the fittings from the tank forward just to ensure there are no leaks. I am going to have him pull the line between the filter housing and IP and attach a clear hose and run it to an open container and look for air bubbles. I am still waiting to hear from one of my club members to see if they found someone local to take a scanner to him.

97 F-350 Dually 5spd 4.10's Daily Driver/Tow Rig
Open air intake, open exhaust, TS 6pos chip, 1.0 ATS turbo housing, gauges

86 CUCV Blazer Rock Crawler 6.2 Diesel, 4spd, 208, locked One Tons, 5.13's, H1 12 Bolt double bead locks

05 Dodge 3/4T Cummins/6spd (Wifes)
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post #10 of 36 (permalink) Old 10-28-2009, 05:43 PM
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You may find some answers here...
I personally do not like the quick connect fitting they give you. I did away with it. Your problem could also be in the basket as well. Mine threw all kinds of codes including IP and it was shoddy work by Lee's Auto Ranch. My advice is to not even mess around, just sight glass it. That will tell the tale quickly. That is what I should have done. I wish I could have gotten better pics of what the fuel basket in my tank looked like. what is the fuel level in the tank while this problem is happening ? Not saying it isn't a dead VP, but check the free stuff first. If the VP was fine before the LP install I'd go over everything. The relays also suck that Raptors come with. They slowly become a resistor. Try making a jumper lead and jump the relay. There is no aspect of the fuel system I have not encountered with these at this point. IIRC if the VP is weak adding strong FP usually causes hard starting.

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