Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech
GL4x4 Live! GL4x4 Casino







Search
Reply
 
Thread Tools
Old June 14th, 2014, 01:36 AM   #1
sabastian
Senior Member
 
Join Date: 05-25-06
Location: Garden City
Posts: 397
iTrader: (1)
Mentioned: 0 Post(s)
Default fuel issue 350 yj

so i'm getting pretty far on this swap. just turned it over for the first time and fired right up, but it stalls after about 2-3 minutes of running.

History:
built a 350 to replace the 2.5 TBI. running 600 edelbrock carb and using the stock fuel pump in the tank. i have to turn the key over 10 times (to prime) to get a reading on the fuel gauge next to the carb. i have a holley bypass regulator mounted to the fire wall before the pressure gauge. a pump of the gas pedal and fires right up, but runs out of fuel after a couple minutes. gauge goes to zero within 1 minute. what could be some reasons or reason i'm running out of gas? the carb was used and never rebuilt. the regulator is new. why is it taking so many turns of the key to get pressure to the carb? it runs, idles, and revs great while there is gas to burn. what am i missing?
sabastian is offline   Reply With Quote
Old June 14th, 2014, 05:21 AM   #2
jbsjunk
Cop Rated
 
jbsjunk's Avatar
 
Join Date: 03-01-08
Location: Almost Allendale Mi
Posts: 12,763
iTrader: (35)
Mentioned: 9 Post(s)
Default

You're using the stock wore out fuel pump I take it? That would be my educated guess. What it the fuel pressure at? Should be around 5-7 lbs. Get a pump for a early 90's 5.7 truck for volume or put a mechanical pump on it and abandon the stock in tank pump and draw thru the stock pump.
jbsjunk is offline   Reply With Quote
Old June 14th, 2014, 05:40 AM   #3
JeepInABox
Jeep yard art collector.
 
JeepInABox's Avatar
 
Join Date: 10-25-07
Location: Fenton
Posts: 2,314
iTrader: (8)
Mentioned: 0 Post(s)
Default

is the fuel pump running with ignition on? or just key on then it turns off?
have you changed the fuel filter? Did you test pump volume flow and not just psi?
JeepInABox is offline   Reply With Quote
Old June 14th, 2014, 11:15 AM   #4
HVYRTFT
Reed my teef
 
HVYRTFT's Avatar
 
Join Date: 01-17-07
Location: Whitehall,MI
Posts: 2,417
iTrader: (9)
Mentioned: 1 Post(s)
Default

Your stock pump cannot flow the volume for this engine that is much bigger than the old one. Get a pump that can produce more volume
HVYRTFT is offline   Reply With Quote
Old June 16th, 2014, 04:17 PM   #5
sabastian
Senior Member
 
Join Date: 05-25-06
Location: Garden City
Posts: 397
iTrader: (1)
Mentioned: 0 Post(s)
Default

ok...so ditch the old stock in-tank pump? it's supposed to put out 15 PSI so I added the regulator to drop it down to 7 PSI. I haven't checked to see if the pump continues running while the engine is running. I can hear it turn on in the "on" position, but does not get enough fuel to the carb with just a single prime. I was trying to avoid removing the old pump, but if that's what I have to do and install either an mechanical or electric pump, so be it.

I have replaced the filter a couple years ago for other issues I thought I was having with the TBI setup on the 4 cylinder. i'm sure all that sitting wouldn't help the cause.

will the 90's 350 pump fit the yj stock tank opening? that would be a pump for a TBI right?

besides the 90's pump, my options are mechanical and external electric with the regulator I have installed? what's preferred by you guys for reliability?
sabastian is offline   Reply With Quote
Old June 16th, 2014, 04:19 PM   #6
sabastian
Senior Member
 
Join Date: 05-25-06
Location: Garden City
Posts: 397
iTrader: (1)
Mentioned: 0 Post(s)
Default

by the way, thanks for the replies! still learning as I go.
sabastian is offline   Reply With Quote
Old June 16th, 2014, 04:23 PM   #7
Wehan
Senior Member
 
Wehan's Avatar
 
Join Date: 10-07-06
Location: Charlotte, MI
Posts: 2,286
iTrader: (25)
Mentioned: 2 Post(s)
Default

I was under the impression that a 4cyl 90's yj pump would run a tbi Chevy 350 no problem, I do believe it is a common fuel pump to use when swaping the tbi 350 into a yj so I would assume it would be acceptable to regulate it down and use it to run a carb'ed 350.
__________________
Wehan is offline   Reply With Quote
Old June 16th, 2014, 06:29 PM   #8
sabastian
Senior Member
 
Join Date: 05-25-06
Location: Garden City
Posts: 397
iTrader: (1)
Mentioned: 0 Post(s)
Default

so was I ??? /\ /\... that's why i'm stumped! I have no problems swapping in whatever is required, but after extensive research on this subject, i'm wondering if I did something wrong or forgot to do something. here's a pic of the install for you guys. I think it came out pretty good. not sure how to make the pic larger.
sabastian is offline   Reply With Quote
Old June 16th, 2014, 06:33 PM   #9
jbsjunk
Cop Rated
 
jbsjunk's Avatar
 
Join Date: 03-01-08
Location: Almost Allendale Mi
Posts: 12,763
iTrader: (35)
Mentioned: 9 Post(s)
Default

Looks good. But if doesn't work, Sort it out. I would run a mechanical pump if you're going to keep the carb. Brainless that way.
jbsjunk is offline   Reply With Quote
Old June 16th, 2014, 07:29 PM   #10
The Defacator
Member
 
The Defacator's Avatar
 
Join Date: 09-20-10
Location: Sylvania Oh
Posts: 55
iTrader: (3)
Mentioned: 0 Post(s)
Default

Fwiw I ran my stock yj fuel pump through a 600 edelbrock carb and regulator for a while. Had a similar problem on the maiden voyage and realized the return was starving the engine. Mine would idle but once under a load starve for fuel. We pinched the return line down and then it ran properly

Sent from my SCH-I545 using Tapatalk
The Defacator is online now   Reply With Quote
Old June 17th, 2014, 07:44 PM   #11
sabastian
Senior Member
 
Join Date: 05-25-06
Location: Garden City
Posts: 397
iTrader: (1)
Mentioned: 0 Post(s)
Default

Quote:
is the fuel pump running with ignition on? or just key on then it turns off?
that was the problem!!! I jumped the relay wires as mentioned on another site just to test it out. it works now. don't like the idea of the jumper so i'll to figure something out for a permanent solution. now I just have to bleed the new brake lines and figure out the electric fan issue.

thanks guys. i'm sure i'll eventually switch to TBI so keeping the stock pump was preferred.
sabastian is offline   Reply With Quote
Old June 17th, 2014, 09:17 PM   #12
BigBird
Duck Shootin' Wheelerer!!
 
BigBird's Avatar
 
Join Date: 07-17-08
Location: Soo, Ontario
Posts: 4,610
iTrader: (8)
Mentioned: 5 Post(s)
Default

Quote:
Originally Posted by jbsjunk View Post
put a mechanical pump on it and abandon the stock in tank pump and draw thru the stock pump.
I tried this in my swap, but it would starve the mechanical pump trying to draw through the electric pump in tank. I had to drop the tank and modify the pickup to eliminate the electric pump.
__________________
Cheap Thrills Off Road
Quote:
Originally Posted by Mr. Beefy View Post
I have not ate in months
BigBird is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech
Thread Tools

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 -5. The time now is 08:02 AM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2005 - 2012 Cracker Enterprises - Powered by Linux
vB Ad Management by =RedTyger=
Page generated in 0.18885 seconds with 36 queries