powerdreams

OK so i finally have the engine out of my 87 sport coupe. I'm trying to clean up my engine bay and remove the stuff I don't need for my carbed vortec 5.7 that's going in in the next few weeks. This is my first complete swap and I'm a little apprehensive about removing things without knowing exactly what I'm doing.

Relevant engine details....holley 750 dual feed carbed 98 vortec 5.7 with electric waterpump,
Relevant car details..........complete heater/AC delete. Manual steering conversion.

Here are my questions.

1, the hard line running up the driver side frame rail to the charcoal canister, Is that the one that needs to be caped or vented? And is there anything special to removing the charcoal canister system when converting to carbed.

2, do i need the vaccume system that i assume to be in the same area as the charcoal canister? Do I need vaccume for brakes?

3, the 2 lines coming up the passenger from rail to what was a mechanical fuel pump.1 feed 1 return?( Which one is which????) What do i do with the return when the feed is attached to the new electric fuel pump?

4, I'd like to covert to manual steering. is there a manual steering box that is a bolt in to replace the original power unit??

I think that's all I need to know for now. Any help would be great!

MrPackstin

iTrader: (9)

1. needs to be vented or too much pressure will build in tank.
2. You must have vacuum for brakes...will be a port on the intake you install on the eninge.
3. I think the large line is the feed and small is the return.
4. Sorry no knowledge of a manual steering on these cars.

powerdreams

Thank you for the speedy reply Mr Packstin, so there will be a port on my intake I use to hook up to my brake booster. Is that correct?

MrPackstin

iTrader: (9)

Yes, sure should be.

powerdreams

I forgot to add few questions,

1, I have a fuel return line, is it used in carbed applications?

2, if I use a holley engine bay mounted electric fuel pump, what do I do with the stock in tank pump?

3, Will i need to upgrade to a high output alternator? (No heat/ac, no radio, no ecm). Electric water pump, dual electric fans. Electric fuel pump.

4, I have two 650cfm carbs. One holley dual feed with vac secondarys and one holley single feed with vac secondarys. Witch one would yeild better results on my mild 355 vortec roller

Sorry for all the questions. I'm still noob

MrPackstin

iTrader: (9)

1. yes; pump has two lines and smaller is the return.
2. not sure about stock pump just leave it and see what happens.
3. no...probably not.
4. I don't think a mild 355 needs the dual feed.

T/Aperformance

1. No you don't need the return line for a carb application. Just cap that line off.

2. For the stock in tank pump you will need to remove it and add or extend the line going to the sock or in tank prefilter. Best thing to do is get a a sending unit for a carb application.

3.No what you have should be fine.

4.The single feed would work great, The dual feed would work great, the dual feed just looks cooler, And if it was my set up I would go for the dual feed.

MrPackstin

iTrader: (9)

Sorry bro....he has to have the return line for the mechanical fuel pump.

vetteoz

iTrader: (13)

You don't.

Elec fuel pumps are "pusher's ,designed to be mounted as close to and below the tank level ( to self prime )
mech engine mounted pumps are "suckers" that use a diaphragm to create a suction that will suckthe fuel to the engine bay.

powerdreams

Wow waking up to the answers I need is awesome..thanks so much guys

powerdreams

OK so I just realized that the 305 that was in my car had a mechanical fuel pump that fed the quadrajet carb and it worked fine. Having said that, would it be safe to say that I could just install the pump mentioned below. Mount it to the fire wall and not worry about what's in the tank pump wise??

Holley p/n 12-802-1
110 PH "Blue" Electric Fuel Pump With Regulator
Rotor/Vane Design, Street/Strip Application, Economically Priced, Gasoline Only

T/Aperformance

First I'm not your bro. And don't be sorry just be your self.

Second since when does a mechanical fuel pump need a return line, And where would that be? Its not on the fuel pump, just one line in and one line out, Its not on the carb that the OP is using, And with that being said The OP is not going to be using a mechanical fuel pump, but instead an electrical fuel pump. I know for a fact that my RV with a big block chevy and on my boat with a SBC that they don't have any return lines , one runs an electric fuel pump one a mechanical, and both ave holley carbs.
So be for you give an answer make sure it is the right answer for the question.

T/Aperformance

Really do not mount your fuel pump under the hood of your car, It is not a safe place. Also like stated before. an electric fuel pump should be mounted near the fuel tank for safety and performance, The fuel pump you have listed can be mounted easily in the spot deigned for the fuel filter.

Is there a reason you want to mount it under your hood on the fire wall?
If you plan on going to the drag strip it will not pass inspection there.

five7kid

iTrader: (14)

All carb'd 3rd gens from the factory had mechanical pumps with a return line.

Personally, I would not run a carb'd 3rd gen without a return line.

I also wouldn't use a Holley electric pump in a street driven carb'd 3rd gen. What I did do with my carb'd 3rd gen is run a Carter M6626 mechanical which has the return built into like the factory pump. It's rated at 120 gph, which should feed the proposed engine just fine.

If you're going to do an electric pump for a mild street engine, then I'd suggest using an in-tank electric pump.

Oh, wait, we're talking about a 1987 model 3rd gen. Guess what - it already has an in-tank electric pump, and if it was factory carb'd, it had an engine-mounted mechanical with return as well. Make sure the in-tank pump is working. If it isn't, neither the Carter mechanical (or any mechanical) nor an external electric will be able to adequately suck through a non-working in-tank electric.

powerdreams

Thanks guys, the 305 that was in the car had a block mounted mechanical fuel pump and yes there is a return line. (2 lines in, 1 line out) my new engine, (98 vortec) does not have a provision in the block for a mechanical pump. So if my car has a in tank electric pump, could I not use that alone or do I need a inline pump with regulator like I mentioned in my last post to achieve the correct ammount of fuel the carb needs??

FRMULA88

A manual steering gearbox from the Chevy S10 pickup will bolt right in place.

You will have to re-use the pitman arm on your power steering box, so be sure to save that.

A Chevy Vega box will work too

powerdreams

Any particular year of s10?