Fuel Pressure HELP
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Senior User
Joined: Nov 2010
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From: Boiling Springs, PA
Fuel Pressure HELP
I just installed the blue spring upgrade for the regulator and had quite a time breaking stuff. I had to replace the housing for the fuel filter/oil filter. I have the 6.0 with the following upgrades:
EGR Delete
New Oil Cooler
ARP Head Studs
4" MBRP Turbo Back Exhaust
Gauges: EOT,ECT,FP,EGT
Upgraded STC Fitting
SCT X3 w/ custom tunes from Matt at Innovative Diesel
My question is this: My fuel pressure is perfectly normal at normal driving and at idle. When I give WOT the fuel pressure diminishes to below 40psi. I obviously do not keep it at that for sake of my injectors. I know in order to keep the tune on I apparently have to get an aftermarket fuel pump such as FASS or Airdog. I was looking at the Airdog website and saw a Raptor. Can anyone explain what this is and if it will solve my problem. I am not planning on anymore upgrades, I have enough power as it is. Any help would be appreciated.
Thanks.
EGR Delete
New Oil Cooler
ARP Head Studs
4" MBRP Turbo Back Exhaust
Gauges: EOT,ECT,FP,EGT
Upgraded STC Fitting
SCT X3 w/ custom tunes from Matt at Innovative Diesel
My question is this: My fuel pressure is perfectly normal at normal driving and at idle. When I give WOT the fuel pressure diminishes to below 40psi. I obviously do not keep it at that for sake of my injectors. I know in order to keep the tune on I apparently have to get an aftermarket fuel pump such as FASS or Airdog. I was looking at the Airdog website and saw a Raptor. Can anyone explain what this is and if it will solve my problem. I am not planning on anymore upgrades, I have enough power as it is. Any help would be appreciated.
Thanks.
Fleet Owner
Joined: Nov 2003
Posts: 27,890
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Did you leave the twisted fuel line in place (or am I mixed up on the thread)? Although, if it were the return fuel line, I don't see how it could make a difference in lowering the supply pressure ......
Pretty much must be either a weak pump or a restriction issue.
Pretty much must be either a weak pump or a restriction issue.
Thread Starter
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Senior User
Joined: Nov 2010
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From: Boiling Springs, PA
I am not sure what you mean by the twisted fuel line? Are you talking about my previous post? If so, yes I did. It was not twisted, just barely kinked. As far as the blue spring upgrade, wouldn't it have a problem keeping up the PSI at WOT since I am running the extreme street tune?
Fleet Owner
Joined: Nov 2003
Posts: 27,890
Likes: 3,610
I will have to defer to others on the fuel w/ an extreme tune. My mild tune has created no issues, but I can see it happening w/ an extreme tune.
One of these days, I would like to install a fuel sump at the tank and an Airdog though!
One of these days, I would like to install a fuel sump at the tank and an Airdog though!
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From: Boiling Springs, PA
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Thread Starter
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Senior User
Joined: Nov 2010
Posts: 246
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From: Boiling Springs, PA
I pm'd npccpartsman and he explained that just because I raised the fuel pressure with the blue spring does not mean the pump can keep up with the volume required by certain tunes. I guess I'm going to have to get a pump if I want to keep the tune. Thanks guys!
Junior User
Joined: Nov 2011
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From: SE Louisiana
I would look for a restriction issue between pump & tank before buying a pump, a hi-perf pump is worthless if it can't get the fuel from the tank.
Junior User
Joined: Nov 2011
Posts: 95
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From: SE Louisiana
1 of my service trucks a 90 7.3 would run great then shut down on the road like it was turned off, come to a stop & start right up, only happen on front tank, so dropped tank & found pickup screen broke, plastic floating around, ton-o-crap in bottom of tank & rust globs in pickup tube, I figured it was getting plastic sucked on pickup, which came off when engine stopped.
Fuel comes with lots of other crap in it!!
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Senior User
Joined: Nov 2010
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From: Boiling Springs, PA
Thanks I guess I'll start poking around. Any advice on testing my block heater? It doesn't seem to be working. I cleaned off the plug and verified the receptacle isn't tripping any breakers. Is there a way to test?
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