CHVYPWR

I need a close up pic of the fuel pump mounting hole on the block.

KED85

I had a 2.8 in my 1985 Blazer.
I swapped in a 3.4 and I am creating the electric fuel pump set up now.
What's the matter with your fuel pump set up?
I have a loose fuel pump handy if ya need a pic.
PS they always leak.

CHVYPWR

I want to modify a FI block, to accept a mechanical fuel pump. The FI block alrady has the holes drilled and tapped for the fuel pump bolts, I just need to see how the hole looks and positioned for the mech pumps arm to fit.

Xophertony

you know you will need to switch to a carbed set up right? the mechanical fuel pumps will only put out like 15 psi, fi requires like 40 psi. you probably know this allready, just makin sure

KED85

the mechanical fuel pumps will only put out like 15 psi,
NOPE
Try 5-6-7 PSI for carbs for our 2.8 engines. More than that & ya "blow apart the carb".

CHVYPWR

I have a carb'd 2.8 in my jeep. I want to use the newer FI 2.8 block. I just need to see how the fuel pump hole looks so I can modify the block to take a mech fuel pump.

KED85

My Carter Electric fuel pump cost me $65.
I splice wires & fuel line & mount securely to frame & be done with it.
This is a temp location a I dial in this 3.4 engine.
Eventually down to gas-tank frame area.

Lee7

He is not asking for you to tell him about your elec setup, and he probably does not care either. He just wants pictures of a carb 2.8 block.

KED85

Just another way to solve the problem.
His choice to comment.

CHVYPWR

Yeah, I just need to mod the block to fit the pump. EXTREME budget work, I have a project car thats getting the real cash! My Jeep is just my beater and the original 2.8 is getting tired I was going to swap over the fuel inj to it, but I don't really feel like trying to stuff all that wiring into areas where theres just no room to stuff it. I'm going to upgrade the carb to a motorcraft/holleystyle 2bbl, swap to a better cam, and go from there. Just if anybody has a carb'd 2.8 laying around, I could use a pic of the pump mounting. Mine is still in the Jeep being driven everday, can't really tare it apart yet

Dale

iTrader: (12)

chevypower, I understand your thoughts. However, if you look at the wiring on a s10 TBI engine, their is not much. It would be a fairly easy install, get better mpg. Also, if you plan on doing any mudding or rock climbing, TBI has proven to be very efficent in this area.

CHVYPWR

The system I have is a mpfi 2.8 from a Camaro. There is a bunch of wires, more than I want to mess with. There not a whole lot of extra room for anything in a Cherokee

Dale

iTrader: (12)

OO, ok, didnt know you already had a setup laying around. Yea, mpfi has quite a few more wires then a TBI setup.

Sorry, dont know anyone who has a carb setup laying around.

Might want to hit up s-series.org and see if any of the s10 peps have one laying around.


*edit*
Another thought, karls electric idea really would be the best. Esp if you plan to swap to MPFI sometime in the future. It wouldnt be the cheapest, but IMO it would be a more durable system then hacking the side of the block, and possibly later having a hole that you would need to plug. Just my .02

Gumby

You should not have any problems. They left the hole there on the "newer" motors for you carbed guys onpurpose. Only one thought is to make sure the FI cam has the fuel pump lobe you need. Might need to swap the cam.

KED85

Budget cheap, you can have my old Mechanical fuel pump for free plus shipping.
The FI cam detail is valid point.
I doubt the FI cam has a lobe for fuel pump push rod.
Shouldn't take more than a day to hook in an external electric fuel pump.
No motor removal required.
If you do decide to do the MPFI set up you do know the fuel pressure will need be 45 pounds of fuel pressure.

He is not asking for you to tell him about your elec setup, and he probably does not care either.
Now you are reading minds LEE7? Goodness let's all bow to you.

Gumby

Yea autozone sells an elctric pump in 12 and 16 psi range for about $20. Use the oil pressure fuel pump switch on the FI block to control it. So it doesn't prime till 7 psi and if the motor dies or you wreck it, gas doesn't flow all over the place while your knocked out and the key is on.

Ive heard a very tragic story about one like that and all anyone could do is liten to the guy scream as he burned alive.

Fuel pump never shut off and fueled the fire.

CHVYPWR

A cam swap is part of what I have planned. I'm going with one that'll give good low end for towing and go well with the 4.10 gears. I don't want to mess with an electric fuel pump at this time. Quick, cheap, and easy, thats the plan

CHVYPWR

If I decided to go with the FI later, I can fab up a block off plate for the pump hole in about 20 minutes, no biggie

CamaroManBlack

uh, guys...doesn't a mechanical pump run off a lobe on the CRANKshaft? I see some talk about cams above, and I think there might be some confusion here, given CHVYPWR's previous cam comment....

CHVYPWR, I do have a carbed 2.8 out of an '82 Camaro sitting in my back yard. It has a plate over the hole though; the guy who owned the car it was in before I did put one of those little frame-rail electric fuel pumps on the car because he had converted the car from a (dare I even say it here) a 4-cyl TBI setup---yes you could get a 4-cyl Camaro from '82 to '85---to a 6-cyl carb setup. He didn't feel like redoing the fuel lines or something, or trying to drop the tank to change the sending unit, or whatever else might have had to be done. At any rate, the motor is out back here under three feet of snow by my shed with a plate over the fuel pump mounting area. If you like, I could venture out back and dig it up, and snap a picture of it for you when I get home from my afternoon classes. I'm not sure what you're looking to see in the picture. Like someone else said above, the hole on your block should be the same....but I'm not sure that the crankshaft would necessarily have the lobe on it to drive the pump. Let me know.

***EDIT*** If you want the picture, did you want it with the plate on or off? Forgot to ask....

KED85

The fuel pump push rod is pushed UP into the block to run off the cam eccentric.
If ya want my free old fuel pump, I've been saving it to give away to one that could use it.
The nuts used on the block were metric, 13mm I believe.

Gumby

The fuel pump runs off the cam. Never seen any lobes on a crank???

CHVYPWR

Hey, if you could get a pic of that without the plate that'd be great!! There is no hole in the MPFI 2.8 block, thats why I need a pic of one with the fuel pump hole. A pic taken from about 10-12 inches away should be good, thanks.

CHVYPWR

Thanks for the offer ked, but I plan on buying a new one.

CamaroManBlack

Hey CHVYPWR, I never got to getting the picture of the fuel pump hole today; we had a bit of freezing rain in the area and it's still coming down. It's supposed to end overnight, so I'll dig the motor out of the ice and snow tomorrow, hopefully.

CHVYPWR

Kewl! If you can, send it to me at maddog1174@hotmail.com Thanks!

CamaroManBlack

CHVYPWR, check your email. The pics aren't as great as I'd have liked them to be, but it is winter and the motor was left outside...not ideal conditions.

If you have to manufacture that hole and moutning area, then I think the guys above have a point when they say to go buy an electric aftermarket pump for carb's. Way too much work for what it's worth to put a mechanical pump on a FI block.

SSC

Ever change change a mechanical fuel pump in a 2.8 jeep or blazer? Sucks!!! Personally I think you would be better off using a cheapo electric pump, since its on a jeep theres plenty of places to stick it. If no one posts a pic I'll see if I can get to the old carbed 2.8 monday and snap a pic, the enigne just happens to be stuck behind the windstar I cant motivate myself to finsh the head gaskets on.

KED85

That's why I posted my electric fuel pump pic as an option.



Heaven forbid ya disagree with lee7, though.