Trying to design a fuel system for a gear head friend.
Some of these questions are why I avoided the electric fuel pump and went with a Race Pump piston style manual pump on my vette.

He's got a Holly Blue electric pump and provided regulator (2 outputs).
Holly duel feed 750 carb.

The diagram below is my setup idea.


Questions:
1.) Can the electric pump be mounted higher than the gas tank? and can I mount both side by side in the engine compartment away from heat? thinking about connecting pump near stock hardline in engine compartment via short braided hose.

2.) Does the inline filter only go on the push side of the electric pump? Wouldn't it be a good idea to filter the fuel before any debris flows into the electric pump?

3.) Is the fuel flow on both outputs of the regulator the same? If I put a fuel pressure gauge on one output, is that the exact fuel pressure leaving the other output? Or does the fuel pressure gauge have to be inline with the fuel being measured?

4.) What micron is recommended for an inline fuel filter?

5.) Any AN fittings that can attach a braided flex line to an original hardline? even if I had to flare the hardline.

6.) When running the electric pump, what should I connect the ignition to to prevent the pump from running if the engine was to die? Is an oil pressure relay the only option?

Your input is always appreciated. Thanks guys

 

you will want the pump at the rear, it is hard to suck the gas that far. run a bigger filter behind the pump and a finer one after the pump if you like. the bigger filter so the pump does not have to work too hard to get the fuel. oil pressure switch can work there should be enough fuel in the blows to get it started then when oil pressure comes up the pump will kick in. yes there is AN lines that hook up to flared ends and then have an on the other side. regulator can be in the engine bay and with the blues and regulator that comes with them there is no need for a return line. both sides of the gerulator will have the same psi.

 

Also ... Probably should include circuit to cut power to pump if and when car gets hit/wrecked ... all modern OE FI have such a switch. That can prevent engine run-on and pump run-on in event of wreck.

 

Thanks Guys.
I wanted to avoid running new lines all the way from the tank even though I know it is recommended that the electric pump be within 3 feet of the tank. Also have to run the electrical the length of the car too. But I'll do what works, near the tank it goes.

brngrhd, got a link to that AN-to-flare fitting on Summitracing.com?

So if the Holley Blue pump does not require a return line then I can just plug the stock return line and give it a go. I'm always nervous of the risk of vapor lock when not running a return line.

 

Sounds like a lot of work - try to convince your friend to stay with his mechanical pump.

 

 

you would use this and a union

http://store.summitracing.com/partde...5&autoview=sku

or somthing like this would work too

http://store.summitracing.com/egnsea...115+4294847275

the top style is how they did the brakes on the rear of my car from side to side on the nine inch. it is also how i hooked up to the stock line from the body to the rear brake hose.

 

Just an "old school" thought. On my '69 there's room aft and to the right side of the tank for an electric pump. Comes out not very far from the tank pickup, so it meets the criteria for both below and behind. If I was going to install an electric pump, (I may again someday), that will be the place.

 

update???? did that work for you?

 

Electric pumps don't work well at all when mounted away from the tank. A Trans Am I bought once had an inline pump under the hood, and the pump struggled to prime itself, especially when the tank was low and the car was parked on an incline. Placed higher than the tank, they will burn up sooner as well.You didn't mention what kind of vehicle this is in, but to me its a good excuse to relocate the battery to the rear since I'm assuming its a non-Vette. I would definitely run the return line, its cheap insurance.

 

I relayed all your good information to my friend and we're still in the planning phase, but your link helped a lot. I've always been curious about those hardline fittings. You have any experience actually using them? If so, they seal the first time? easy to use? no leaks?

Yeah, I had a feeling the self priming would be an issue if the pump was above the tank and far away. But I've never run an electric pump myself so thats why I asked. Sometimes I "over-think" things...ok I do that all the time.
Thanks for all your info!
Oh, and its an 80 Trans Am with a 400 engine