The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain > LSx Swaps

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-16-2016, 02:25 PM   #1
H20cooled
Registered User
 
Join Date: Sep 2014
Location: Milwaukie, OR
Posts: 223
4.8l suddenly issues.

So I have had my 4.8l swap going now for around a year with no issues and suddenly I'm having problems. It will start up just fine and run for 20 to 30 mins then it dies and does not want to start. My setup is:

2001 4.8l 140k miles on it.
returnless rail
Wix regulator/filter
rear install FI tank with walbro pump

The last time it did this I pushed the schrader valve on the fuel rail to see if I was getting fuel and it shot a little out and I went to try to start it and it fired up. So I figure my fuel injectors were bad, I replaced them and added a pressure gauge to the rail and it fired up fine. Drove for 20 mins and it died again. I had my wife turn the key on but not start it and I noticed that the fuel pressure went right up to about 55 and then very quickly went down to 0. From what I understand it should not do this, so I'm wondering what is failing. Fuel pump? Regulator? Something else?

Any help would be great.

Thanks,

Rich
H20cooled is offline   Reply With Quote
Old 04-16-2016, 05:35 PM   #2
ls1nova71
Registered User
 
ls1nova71's Avatar
 
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
Re: 4.8l suddenly issues.

If its an in tank pump, the hose between the pump and pick up tube could have a hole in it. There a specific submersible fuel hose for the application but most guys use the regular stuff and it can come apart.

Could also be a bad filter/regulator. What brand is it?
__________________
My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html

5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
ls1nova71 is offline   Reply With Quote
Old 04-16-2016, 05:44 PM   #3
H20cooled
Registered User
 
Join Date: Sep 2014
Location: Milwaukie, OR
Posts: 223
Re: 4.8l suddenly issues.

It's intank pump, fuel lines and setup is less than a year old. If it was a hole in the line I would assume I would see fuel coming out of the line and smell gas. Thinking its the regulator.
H20cooled is offline   Reply With Quote
Old 04-16-2016, 05:55 PM   #4
solidaxel
Registered User
 
solidaxel's Avatar
 
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
Re: 4.8l suddenly issues.

He may be talking about the rubber connection on the fuel pump in the tank
__________________
53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD)
53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25
55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73
62 Solidaxle Corvette Roman Red (327
340hp 4spd 3:36) C4 & C5 suspension tube chassis
LS 3 4L70E
65 Corvette Coupe 327 350hp 4spd 4:11
78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42
2000 S-Type 3.0 (wife cruiser)
2003 GMC SCSB 5.3 4L60E 3:42
solidaxel is offline   Reply With Quote
Old 04-16-2016, 06:26 PM   #5
H20cooled
Registered User
 
Join Date: Sep 2014
Location: Milwaukie, OR
Posts: 223
Re: 4.8l suddenly issues.

I would hole that after less than a year it would not be damaged on the pump side.
H20cooled is offline   Reply With Quote
Old 04-16-2016, 09:07 PM   #6
H20cooled
Registered User
 
Join Date: Sep 2014
Location: Milwaukie, OR
Posts: 223
Re: 4.8l suddenly issues.

I bought a new Wix regulator/filter and I will replace it tomorrow and see what happens.
H20cooled is offline   Reply With Quote
Reply

Bookmarks


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 -4. The time now is 12:43 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com