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Unread 05-18-2014, 06:37 PM   #1
Sportinwood
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TBI 350 help

K so last year I swapped in a 88-92 chevy tbi 350. I've had problems with getting it to run right. I've been through all the wiring, vacuum lines, and sensors a dozon tims or more now. Nothing seems to make it run any different. I've narrowed it done to fuel pressure. I know that this tbi system should run at 10-15 psi. Usually that is around 13-14 psi. I am at 8 psi when idling and I drop to as little as 2-4 psi WOT. Now the question is what fuel pump should I buy. I've seen suggestions of the E2000, E2182, and E8248 all of witch seem to be pushing over 100 psi. I have an E8248 that I've tried and even trid to regulate it down but it would seem next to impossible to regulate 120 psi down to 13-14 psi. I also have a fuel pump that is rated at 13-14 psi but thats the one I'm only getting 8 psi out of. So can anyone tell me what to buy and if it's a high pressure pump how to regulate it down??

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Unread 05-18-2014, 06:51 PM   #2
jcal73
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Those pressures are what they are capable if running.
The pressure regulator in the throttle body will regulate just fine as long as you don't use some extremely high volume pump.

It sounds like you don't have enough flow now with the pressure dropping at WOT.
What size lines are you running for pressure and return?

Jeff
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Unread 05-18-2014, 07:15 PM   #3
Sportinwood
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I'm running 3/8" fuel line right now. To me it really seems like the pump I have right now it just way too weak. So are you saying the fuel pressure regulator that is on the tbi will regulate the 100+ psi down to where it should be? I have had that high pressure pump on it with an aftermarket regulator before the tbi but I was only able to regulate it back to about 35 psi.
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Unread 05-18-2014, 07:26 PM   #4
Sportinwood
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Scratch that it's 1/4" supply and 3/8" return line.
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Unread 05-18-2014, 07:37 PM   #5
lar308
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Gm runs 3/8 supply and 5/16 return. Ron
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Unread 05-18-2014, 07:43 PM   #6
Sportinwood
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Also I have not tried my higher pressure pump again since I went through a few other problems. First off when I had the high pressure pump on I was running hot hot hot!!! Boiling over. I think I fixed that problem with a new aluminum radiator, flex fan, and a 180* thermostat. I seem to be holding tight at 180* now. Second problem I fixed since I last tired the high pressure pump is originally the pump was wired direct to accessory so it was on all the time while the ignition was on. Do you think now that my wiring and temperature control is proper that the high pressure pump would work better?
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Unread 05-18-2014, 07:48 PM   #7
Sportinwood
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Thanks for your help guys! I've been banging my head against the wall with this one. I'll check out some new fuel line's. Maybe that's all it needs. I can get 14 psi from the pump I have on it if I pinch the return line although it does still take a little while of cranking before I get that 14 psi
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Unread 05-18-2014, 08:00 PM   #8
dg6772
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I had Napa make me up some lines,plastic, 3/8" feed 5/16" return. Then with compression fittings,connected them to the factory lines to the tbi. With this I'm running a stock pump (GM) in my cj thank. So far,it's as reliable as ever. Always starts,getting 16 mpg with 4.10s, 33's and a 700r4. I also have quick disconnects on lines and fuel filter as well. My object was to build with as many off the shelf parts as possible so replacement parts are easier to get; quickly.

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Unread 05-18-2014, 08:12 PM   #9
Sportinwood
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Thanks Dave. Do you have a part number for the stock gm pump by chance? Also is that in tank pump the inline type pump or is it the one that mounts to the top of the tank with a float and other stuff on it?
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Unread 05-18-2014, 08:32 PM   #10
dg6772
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It's the stock pump from 1987-1995 I believe. I'll check to see if the number is on one, as I have 3 or 4 laying around. The pump hangs from the sending unit,suspended into the tank. I added the brackets to my cj sending unit from a Chevy donor.
I found no numbers on any of the 3 pumps I have,but I set it up with a 92 pump and just replaced it with one from an 87.





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Unread 05-18-2014, 08:38 PM   #11
Sportinwood
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Nice! Are you running the 21 gallon tank or the 15 gallon tank?
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Unread 05-18-2014, 08:40 PM   #12
dg6772
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The 21; original to my not so original 86 CJ7

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Unread 05-18-2014, 08:45 PM   #13
Sportinwood
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Ya I still have the 15. I'm wanting to swapp it out but budget is a little tighter than I'd like already. I think my tank might be a bit too shallow for your settup.
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Unread 05-18-2014, 09:03 PM   #14
Sportinwood
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I started out with an amc 360 with an eddlebrok carb and a tf727. I was having problems with the kickdown aside from just not really liking auto transmissions. So I decided to stick an sm 465 trans in it. In doing that I figured while I had it apart I might as well rebuild my Dana 300 tcase. Well while I had that apart I thought why not put the low max 4:10 gears in it? So I did. Well now I have a shiny new trans/tcase combo.... lets look at that pesky rear main leak. Well got into the oil pan and found Babbitt didn't like that too much so I went ahead and found a tbi350 with low miles to stick in it. In a couple months and a couple thousand dollars in Novak adapters I had it all back together. Drove it up deer hunting for the first time and ran into cooling problems. Well after another couple thousand dollars and some time on my back in the snow in the mountains I figured that problem out. Finally last year out of shear frusteration I parked it and covered it up. I just pulled it out last week to try again with it. LOL JEEP=Just Empty Every Pocket
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Unread 05-18-2014, 09:06 PM   #15
dg6772
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It shouldn't be....you just need to set it so the screen on the bottom of the pump is at the same level the stock pickup would be. This shouldn't be very difficult to assemble. You'll need a cj,or whatever your using,sending unit,a gm sending unit,a soldering iron (a big one) and some cutting tools. This is when I changed mine to quick change fittings. The elbows are available at Parts Plus. They are a elbow repair kit,no number, sorry.
I had to fiddle with the parts so they would fit through a cj sending unit hole as its smaller than a gm hole is.
This shouldn't be too bad to do. I did it,and I'm just a do-it-yourself. And do it I will,if at all I can. So far,I drew the line at a transmission rebuild because of time restraints and that's it. You are out nothing but a few small bucks to try it; if in fact its what you want verses the in-line pump.
Good luck...

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