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Old 01-06-2010, 11:51 PM   #1
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Chevy conversion issue

I have recently finished swapping in a chevy 350 into my 1990 wrangler the past two weeks, I'm using the advance adapters engine mount relocater... The motor originally had a mechanical pump however I had to remove it because the cross member on the mount is in the way and There is really not way to modify it. So I tried putting a mr. Gasket micro pump on but I can not get fuel to run through my lines. I've been at this for 3 days now... I've searched high and low for ideas and I can't find any. The pump is hooked up to my ignition, I've got fuel to go though my lines by using a hand pump and the micro pump was able to then move the fuel constantly until I turn it off...

Has anyone else experienced a similar problem?? Any ideas, information, or comments would be MUCH appreciated.

-Jay

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Old 01-07-2010, 12:09 AM   #2
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Welcome to the forum Jay,
Where do you have the pump mounted? From what you describe it sounds like the pump is losing prime once it is turned off. It should be mounted as low as the bottom of the tank, If it is then check your connections and make sure you have a good ground.

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Old 01-07-2010, 12:12 AM   #3
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I'm not familiar with the 90's but do you have a stock electric pump in your tank?...... From past experiences, i found it hard to pull fuel through a in tank electric pump when it's off..If you do have a stock electric in-tank pump, it may be blocking fuel from getting to your new pump..... Not true to all pumps so it's just a thought..... I myself am using the stock electric in-tank pump in my 91 to fuel my carburated 350 ..
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Old 01-07-2010, 12:20 AM   #4
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Thank you. Well I originally mounted it on the fire wall, then realized that it was not the correct way so I brought it against my rear driverside frame rail right where the rubber hose goes from my fuel take to my hard line, however it still wouldn't pump. My ground is a selftapping bolt onto my frame so that shouldn't be the issue. My thought is that I may have shorted the pump or it isn't a high enough psi pump. I can hear the pump working though and it says it's made for carburated motors... Maybe I shouldn't have cheaped out on the pump.

Do you know of a better alternative?
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Old 01-07-2010, 12:23 AM   #5
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Quote:
Originally Posted by uplifted View Post
I'm not familiar with the 90's but do you have a stock electric pump in your tank?...... From past experiences, i found it hard to pull fuel through a electric pump when it's off..If you do have a stock electric pump, it may be blocking fuel.. Not true to all pumps so it's just a thought..... I myself am using the stock electric pump in my 91 with my carberated 350 ..
My original 4.2L had a mechanical fuel pump as well so there shouldn't be an intank one. What pump are you using/where did you mount yours??

Thanks for the quick reply's guys.
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Old 01-07-2010, 12:27 AM   #6
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My YJ was originally a 4.0 FI so i have a stock in-tank electric pump.... works great.... If i were you i would look into maybe mounting your pump down on the frame rail were it will be lower than the tank,,,and look into a better pump........I'm running the Novak engine mounts and they allow for just about anything... ample room..

The cheapest pump that i would even use would be this..

http://www.summitracing.com/parts/CRT-P4070/

I don't think your little mirco pump is enough.
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Old 01-07-2010, 12:33 AM   #7
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Ah, I see, I'm highly considering getting an intank pump however I believe they pump pretty high psi which I believe would cause my motor to run lean... I suppose some type of regulator could be used??
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Old 01-07-2010, 12:34 AM   #8
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Quote:
Originally Posted by uplifted View Post
If i were you i would look into maybe mounting your pump down on the frame rail were it will be lower than the tank,,,and look into a better pump
x2...Jegs sells a decent pump for $80 if it is carburated.
JEGS 15913 JEGS Street/Performance/Race Electric Fuel Pumps
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Old 01-07-2010, 12:37 AM   #9
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correct... I'm using a mallory regulator with a return line... knocks my in-tank pump pressure down to 6 psi for my carb..... I will eventually buy an aftermarket FI setup for my SB chevy, just not ready to shell out another 2 grand just yet ..

Fuel regulator i used

Mallory Ignition 4309 - Mallory Fuel Pressure Regulators - Overview - SummitRacing.com
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Old 01-07-2010, 12:49 AM   #10
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Thanks again guys, seems that I should look into a better pump with a regulator, I have one last thing I will check and that's to make sure I'm getting the require 12V to the pump. I'm confident that it is but it won't hurt. The pump was the one thing I thought I could just go cheap with but apparently not. What kind of work if any do you have done to your 350 uplifted?
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Old 01-07-2010, 01:00 AM   #11
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Bare in mind i have built race cars my whole life so the off-roading thing is new to me...So with that said my engine looks more at home in a muscle car than a jeep but i don't care.... runs like an animal.... it's a ZZ4 crate engine with a bit of a twist.

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Old 01-07-2010, 01:12 AM   #12
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Bare in mind i have built race cars my whole life so the off-roading thing is new to me...So with that said my engine looks more at home in a muscle car than a jeep but i don't care.... runs like an animal.... it's a ZZ4 crate engine with a bit of a twist.

Wow, very nice, that looks incredible. I'm actually in the same boat as you, I'm building this jeep for speed not offroading believe it or not, although this will be my first vehicle I've built. I've actually been asking around also about better handling suspension also, not that I expect it to race formula 1 hahaha. But it'll be pretty cool to have a sleeper jeep.
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Old 01-07-2010, 01:13 AM   #13
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That is one good looking engine bay.
scott
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Old 01-07-2010, 01:25 AM   #14
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Got my profile up with additional pics .... Thanks for the kind words guys
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Old 01-07-2010, 01:31 AM   #15
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I see you have a ford 8.8 that's the next part of my jeep to get upgraded for the supercharger I have planned. I'm assuming you did the work yourself. What kind of time did you have to put in for that?
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Old 01-07-2010, 01:38 AM   #16
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Yes,,, i manage a auto shop here in NY for the past 20 years... all the work is my own..saves a ton on labor charges ........ The 8.8 was an extremely easy swap... came out of a 98 explorer... just shaved off all the brackets and welded up new spring perches (25 bucks) and new shock mounts (25 bucks)... installed a new gear set to match my front diff, modded the ford e-brake cables to fit my jeep and used a offset ujoint to join the ford rear to my jeep driveshaft..... total cost was about 550 and that includes buying the rear, gears, bearings, perches and mounts..... total time, maybe 6 hrs from the first cut to the install..
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Old 01-07-2010, 01:44 AM   #17
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Thanks for the information, seems do-able to me. The more customization needed the better in my opinion!
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Old 01-07-2010, 01:49 AM   #18
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LOL i agree.... keeps me out of the house.. ... remember, the key to a happy marriage is to stay the hell away from each other.. ...the jeep helps
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Old 01-07-2010, 08:13 AM   #19
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Sorry to hijack this thread, but what kind of center counsel/arm rest are you using in your jeep? Mine annoys me so much because it isn't high enough for my elbow to rest on.
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Old 01-07-2010, 09:09 AM   #20
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That looks great uplifted.
Good luck with your swap Jay.
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Old 01-08-2010, 07:25 PM   #21
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Does anyone know what the "trans mount adapter" for a TH350 looks like? From what I understand it more or less bolts up the the skid plate... Would anyone be able to take some pictures and maybe get some overall dimensions ?? Any info would be much appreciated.

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