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Old June 14th, 2014, 01:36 AM   #1
sabastian
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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.

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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?
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Old June 14th, 2014, 05:21 AM   #2
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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.
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Old June 14th, 2014, 05:40 AM   #3
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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?
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Old June 14th, 2014, 11:15 AM   #4
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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
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Old June 16th, 2014, 04:17 PM   #5
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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?
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Old June 16th, 2014, 04:19 PM   #6
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by the way, thanks for the replies! still learning as I go.
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Old June 16th, 2014, 04:23 PM   #7
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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.
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Old June 16th, 2014, 06:29 PM   #8
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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.
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Old June 16th, 2014, 06:33 PM   #9
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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.
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Old June 16th, 2014, 07:29 PM   #10
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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

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Old June 17th, 2014, 07:44 PM   #11
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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.
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Old June 17th, 2014, 09:17 PM   #12
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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.
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