The Diesel Page Forums

2020 - TDP's 24th Anniversary
What's New | Feature Articles | Product Reviews | Member's Area | Free Forum Registration
Duramax 6600 Diesel Page | Advertiser's Section | Classified Ads | The Diesel Page - Publications

Go Back Forums > Other Diesel & Truck Related Forums > Diesel Conversions

Diesel Conversions Convert gas to diesel, or convert to a 6.2/6.5/Duramax/Cummins/Navistar/Isuzu/Perkins/Detroit/or ... diesel engine. Go here to see completed projects, works in progress, share your conversion or ask the experts.

Thread Tools Display Modes
Old 01-07-2018, 11:42 AM
Join Date: Jan 2018
Location: FL
Posts: 1
Default Detroit Diesel 638 engine problem, please help

I have a Hyndai HLD 150/Bering LD-15 truck with a Detroit 638 that has a strange problem. The engine starts and runs fine, but after few mieles when driving the engine develops a hesitation and looses power. It gets progressively worse to the point where u can only drive about 20mph after a few miles the engine shuts off, and it wonts to start, unless you whait few hours then the engine starts without a problem,
When the problem started you could drive normal for 100 miles normal, now its maybe 10 miles then its starts to losses power.
If u shut the engine off and let it sit a bit the problem goes away for next few miles.
We removed the fuel tank cleaned it and cleaned all the fuel lines and changed the filters and this did not help at all. We bought
a new injection pump and it alsow did not help. I'm not sure what to do next and was hoping someone may have seen this problem in the past and may have a solution.
Please Help. Thanks.
Reply With Quote
Old 01-08-2018, 09:38 AM
Yukon6.2 Yukon6.2 is online now
Join Date: Dec 2003
Location: Yukon Canada
Posts: 1,160

I would hook up a small tank of diesel as close to the lift pump as i could.Add a fuel pressure gauge and try it again.You could have a line were the inside is collapsing and plugging the fuel flow,either before the lift pump or after.
A fuel treasure gauge will help you see if the lift pump is making pressure when the truck stalls.
I have had a rubber line falling apart inside and the bits of rubber would pile up and form a plug either in a fitting or elbow and act just like what you are describing.Wasted a lot of time and filters finding that one.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews
Reply With Quote
Old 02-13-2018, 01:09 AM
MaxJacob MaxJacob is offline
Join Date: Feb 2018
Location: Tampa, Florida
Posts: 13

Thanks for the tip, man! I'll be taking note of this.
Reply With Quote
Old 02-23-2018, 10:35 PM
cowboywildbill's Avatar
cowboywildbill cowboywildbill is offline
Join Date: Oct 2002
Location: USA
Posts: 1,231

Way back years ago I had a pin hole in a fuel line on a Brockway Cab Over Tractor. It didn't leak fuel out but would suck air in. Had the same symptoms as you are describing.
Was a pain to find. Finally just replaced all of the fuel line.
Let us know what you find.
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -7. The time now is 11:12 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1996-2020 by - All Rights Reserved