Fuel pressure drop - Ford Powerstroke Diesel Forum
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  #1  
Old 11-07-2007, 01:06 PM
Navy Beer Guzzler

 

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Fuel pressure drop

I am running 58 psi at idle. When I stand on it the pressure drops to 53 psi is this ok or am I starving some injectors? Does anyone have pics on doing the BB in the fpr mod also pics of the fpr screen on cleaning it. I have read directions but pics would help tremendously. What is the difference in doing the shim or the BB?

Mike
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Old 11-07-2007, 01:28 PM
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You can expect some drop. That does not sound like a terrible drop in pressure to me. Now if you were dropping down to like 20 psi like I was doing for a while, before I put the ITP regulated return on, then yes I would say you were starving the injectors. I as sure there will be others along to give your their opinions as well.
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Old 11-07-2007, 01:32 PM
Desert Shield/Storm Vet

 

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Yeah as long as your over 50 psi your cool
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Old 11-07-2007, 01:33 PM
Navy Beer Guzzler

 

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Well I appreciate it. I am trying to figure out why I am only getting 18 psi of boost all the sudden when I used to get around 25 with my SCT on max power. I have checked all exhaust and intercooler tube connections and cant find any leaks so I though fuel pressure might be lagging a little.
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Old 11-07-2007, 01:37 PM
Desert Shield/Storm Vet

 

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Check the plastic line to the boost gauge for any kinks.
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Old 11-07-2007, 03:22 PM
Navy Beer Guzzler

 

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My quadzilla commander reads off the map sensor
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Old 11-07-2007, 03:23 PM
Navy Beer Guzzler

 

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I dont have the map fooler on right now.
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Old 11-07-2007, 03:25 PM
Navy Beer Guzzler

 

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I disconnected red wastegate hose and it gets up to 19 but it seems like it starts missing at idle is that possible for the red line to cause that.
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Old 11-07-2007, 03:38 PM
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That’s not a bad drop in pressure at all. Mine was dropping from about 50 psi to close to zero, that’s what made me find out I got a bad load of fuel and stopped up my whole system with trash. I did the fuel tank and pre pump filter mods and put a California spring in the FPR and now she hold around 80 psi and only drops about 10 psi at full throttle. Unplugging the waste gate hose from the actuator and sticking it on an inner cooler boot bolt should not affect idle in anyway. By the way, I still could get near 28 psi boost with the crapped up fuel system. Now runs about 30-32 after I built the engine and installed the new injectors.
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Old 11-07-2007, 03:52 PM
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I have thrown so much money at this truck and it keeps running like crap. I have new cps new icp new ipr. The truck still idles rough had intermittant loss of power. I think the engine is sound but I am having some kind of intermittant problem. Sometimes it runs like a scalded ape then sometimes it just flat fall on its face. I am not a mechanic but I also cant find a good one here. They all throw parts at the problem and dont fix anything who has got the closest good mechanic to Austin Tx. Please Help. Before I set this thing on fire.
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