dropping fuel pressure with 175s - Ford Powerstroke Diesel Forum
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Old 08-07-2014, 08:28 PM
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dropping fuel pressure with 175s

Well guys I have been driving the truck with 175/75s for about 4 months now and have been babying the truck. Well I am tired of only being able to use 1/8th of my pedal. If I mash the go pedal 1/4 of the way it instantly drops to 50 psi on TSD's daily street tune. I have only stabbed it to full throttle once and it bottomed out my gauge. I do not have any fuel upgrades other than the injectors. The question I have is do you all think maybe my factory pump is really weak or is it just because I don't have a regulated return? Either way I have to solve this problem. If the factory pump is the culprit an air dog 150, sump, and RR won't solve the problem will it? I want to do a full fuel system but I just don't plan on keeping the truck but another 8 months or so. So I want it fixed right but dependable and I have heard the A 100 and fuel labs tend to be less reliable. What is everyone's thoughts, and before someone says use the search button I would like to state that I have searched and read all the ones relating that I could find dating back to 2007.
Thanks jonathan
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Old 08-07-2014, 08:31 PM
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Sounds like a weak pump, try putting a new factory pump in and see what it does.
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Old 08-07-2014, 08:34 PM
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That is exactly what I was thinking but I wanted yalls opinions before I dropped $600 on a new one.
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Old 08-07-2014, 08:43 PM
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I ran the factory pump with a air dog 150 for a while but the factory pump started to die once I went up on injectors. I them did a fuel lab with the air dog. No drops any more
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Old 08-07-2014, 08:45 PM
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I would seriously invest in a fuel system. Regulated return and all. It's a big help and when you have decent sized injectors like you do you should be keeping them fueled and happy
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Old 08-07-2014, 09:09 PM
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I kind of figure that, but I hate to spend $2000 on a fuel system when I am planning to sell the truck in less than a year. I was hoping a RR, sump, and new hfcm may do the trick. Oliver if u will PM me a price on a set up like what your talking about. Couldnt i get away with out a lift pump.
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Old 08-07-2014, 09:13 PM
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Pm sent bud
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Old 08-08-2014, 06:59 AM
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I have had those same issues for a year. Bought 2 brand new factory HFCM's and even added a Airdog 150 and it never solved my low pressure issues. I should have my new system with larger lines and Fuelab pump done tomorrow.
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Old 08-08-2014, 10:43 AM
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Wow. You have low pressure issues with 155/30s? I never would have guessed that size injector would cause problems.
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Old 08-08-2014, 11:42 AM
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I don't know why. I bought 2 used factory pumps and it didn't fix it. I put a sump and Airdog 150 and it helped but still dropped into the 20's under WOT. I then replaced the lines from the factory pump to the fuel bowl, no difference. The last thing I did this spring was replace the factory pump with not one, but 2 brand new factory pumps and it didn't help one bit. I finally said screw it and I am in the middle of replacing everything from tank to the engine and back. I must have the thirstiest 155/30's on the planet. Everyone on said it had to be the factory pump, but there is no way I had a total of 5 bad ones.
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