Fuel pressure question
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Tuned
Joined: Feb 2004
Posts: 343
Likes: 30
From: Maryville, TN
Fuel pressure question
I’ve had a gauge for 80k miles now and was ok with what I was seeing, max 70 and min 40 on a hard long pull. Idles was 60ish and cruising in to 50-55 range depending on weight and ambient temp.
It’s been that way for years. A week ago I blew one of the return lines (what a mess). I replaced both of them and now all my numbers are 8-10 psi higher which I certainly didn’t expect because it tells me my lines were bulging/flexing for way too long. I did the bb mod years ago and maybe I should have done return lines first, it just never occurred to me.
Reading here tells me 50-80 is an acceptable range so I should be ok but I wonder if there is an optimal goal and what the impact of exceeding 80 psi might be? I could be pushing that downhill in the mountains, won’t know til I get there.
I know e-fuel is considered the ideal but that’ll have to wait for some downtime along with all the other shoulda coulda wouldas.
Bob
It’s been that way for years. A week ago I blew one of the return lines (what a mess). I replaced both of them and now all my numbers are 8-10 psi higher which I certainly didn’t expect because it tells me my lines were bulging/flexing for way too long. I did the bb mod years ago and maybe I should have done return lines first, it just never occurred to me.
Reading here tells me 50-80 is an acceptable range so I should be ok but I wonder if there is an optimal goal and what the impact of exceeding 80 psi might be? I could be pushing that downhill in the mountains, won’t know til I get there.
I know e-fuel is considered the ideal but that’ll have to wait for some downtime along with all the other shoulda coulda wouldas.
Bob
Lead Driver
Joined: Sep 2002
Posts: 9,500
Likes: 2,021
From: North Texas
Mine idles in the upper 60s with Efuel. Seems tine to me!
I blew one of those lines too about four or five years ago. I tell everyone to install new if not documented. Riffraff now makes HD lines, I have Motorcrap as the RR units were not available at the time. Those are like that PS high side hose to me. 10 years of daily use? Spend the $120 and replace those three lines.
I blew one of those lines too about four or five years ago. I tell everyone to install new if not documented. Riffraff now makes HD lines, I have Motorcrap as the RR units were not available at the time. Those are like that PS high side hose to me. 10 years of daily use? Spend the $120 and replace those three lines.
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Tuned
Joined: Feb 2004
Posts: 343
Likes: 30
From: Maryville, TN
I may have spoke too soon and assumed that because my idle and cruise pressure is up 10 points that my high and low would be as well. That’s doesn’t appear to be true so far.
I was able to push it pretty hard for an extended time getting on the interstate with the camper on today and saw 43 as the low and so far 72 was the highest I’ve seen at higher rpm foot off the throttle.
I ended up getting my lines made at a local hydraulic shop. Bio friendly 250 psi lines for $60.
thanks for the advice, I feel comfortable with these numbers for the time being.
Bob
I was able to push it pretty hard for an extended time getting on the interstate with the camper on today and saw 43 as the low and so far 72 was the highest I’ve seen at higher rpm foot off the throttle.
I ended up getting my lines made at a local hydraulic shop. Bio friendly 250 psi lines for $60.
thanks for the advice, I feel comfortable with these numbers for the time being.
Bob
Laughing Gas
Joined: Oct 2019
Posts: 949
Likes: 109
From: Fowler Colorado
Mark does not provide you with a gauge. It has a tap in the top of the fuel block for the schrader valve when you get a gauge that’s where it goes. Glow shift gets a bit of hate but I like them on my truck and they were very affordable
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From: Fowler Colorado
I honestly don’t know. They’re half the price as most and a third if isspro yes but I never had any issues with them and they seemed to work perfectly. I guess people think they’re just cheaply made. I thought they were pretty good
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