bcty

Just trying to deal with the fuel system now.. i have a holly 600 and i was wondering what psi i should be running the fuel at.. side note.. this will be mostly a track car but will see the road a couple of times.. and what fuel pumps do u recommend? my bud just got a regulator thats 1-4 psi and a carter fuel pump.. i was going to so pick this setup up too i just wanted to know if theres anything i should be looking for? and plus i know on the 2nd gens there are some weak grounds that can be fixed.. is there any bad grounds or grounds that could be inproved on, on the 1st gen? thanks guys!

Tyler

REVHED

Holley's need 6psi. I'd maybe try running the 7psi Carter without a regulator as that should be pretty close to 6psi at the carb. Either that or run a Holley Blue or Carter Black with a 4.5 to 9psi Holley regulator.

bcty

any info on what the holley BLue and Carter Black flows? is it a better idea to buy a bigger fuel pump like 10 psi and down regulate it to 6 psi to is it better to buy a 6psi pump and run with a regualtor or no regulator at 6 psi?

REVHED

That's what I would do. Either pump will flow enough fuel for any 12A application. I'd go for the Carter though as it's a better pump in my experience.

specRX7_22

i run the big *** Carter with a holley regulator. im not sure exactly what the pump is rated at, but ill tell ya this... my buddys regulator failed open, and he was getting over 30psi.

also.. isnt 6psi a little high? if this is a track car, you probably want to go a little leaner, am i wrong? im not gonna tell ya what i had my regulator set at (road racing), but it was definately under 6!

--eric

Wankelguy

My 1985 Racing Beat catalog says 6 psi for the Holley.
It also mentions using a Facet pump which is internally regulated to 6 psi with the caveat that this pump is only good for motors developing up to 160 hp. If the engine is modified to produce more than 160 hp, they advise to "parallel" two of these pumps for adequate volume capability. I have one of the Facet pumps on my stock 12A, perhaps that has something to do with why I'm dumping gas down the intake when I turn it off, now that I think of it. Man, I love this old book! -WG

bcty

what does the holley regulators come in.. i know there 1-4 and i know there 4-10 i think.. can i buy just a regulator thats set for 6psi? and ill try a 7 psi carter and see where that puts me.. but any ideas on a regulator thats set for 6?

specRX7_22

so i take it you dont think 6psi is high for a track car?

--eric

diabolical1

iTrader: (3)

the pressure depends on the carbie. that's way too high for Webers and Dells, but that's just enough, maybe even a pound or two, too low for a Holley.

as for the original question. Revhed is right. just run the Carter or Holley pump without a regulator. either one is good, but from what I undersatnd, the Holleys are more expensive and rebuildable, whereas the Carters are less expensive and not rebuildable - (I have a Carter, but it if ever fails, I'll get a Holley)

and check out rx7guru's thread on Holley tuning ... it's worth reading if you have Holley.

bcty

hey thanks a lot guys!! ill head down there today and get me a Carter for now.. any ideas on how difficult it is to install.. i dont have a haynes manual with me.. but its under the car right? not in the tank? and theres just a power wire and a ground right? thanks for all the help... much better then the 2nd gen forum.. you get lots of flack there..

Tyler

REVHED

There's a perfect spot for the Carter on the chassis frame rail just where it starts to curve up before the diff.

To mount it you need to drill a couple holes in the rail and bolt the bracket down with the self tappers provided in the kit. You'll also need to do some minor re-routing of the fuel lines and possibly relocate the fuel filter. I'd suggest buying some 3/8 (or was it 5/16?) fuel hose as well as one or two 90* degree fittings for the pump. The fittings that come with the pump aren't suitable as they're too large and a straight fitting will leave the inlet line too close to the diff.

For the wiring, just use the stock pump postive wire and connect the negative directly to the chassis.

Good luck.

bcty

sweet thanks for the help.. i managed to pick up a 7-8psi max carter pump and ill put that on there without the regulator and see how it goes...

specRX7_22

put the carter in the same place as the stock pump was. all i did was hammer the thing it fits into, into a shape which the carter fit, stuck a piece of rubber in between for vibration's sake, and somehow (i forget but can find out if you want) strapped it up. it was really quite simple actually.

--eric

REVHED

Yeah, that would be good if the instructions didn't specifically say not to mount the pump horizontally. By doing it your way you're also foregoing the nice bracket and rubber grommets that come with the pump. These make it a lot quieter especially when bolted to something solid like the chassis rail. I can only imagine how loud yours is strapped to that dodgy sheet metal thing and then to the floorpan. But hey, whatever's easier right.

bcty

how do u think my cars gonna act with this pump in and no regulator? the engine only has 20 km on it.. its in the break in period.. do u think its better to wait till ive gone though the break in? and then install?

specRX7_22

haha yes it is kind of loud, until you start the car (straight pipe) then you dont hear it at all! lol. but it was very easy to do and im not complainin about it.

also, there was no other choice because the SRX7 rules state that if you have an aftermarket fuel pump it has to be within [some number] of inches of the stock pump's place.

--eric

Wankelguy

Yeah, I have my Facet pump bolted to the floor pan and it sounds like a little air-hammer, even with the couple of layers of inner-tube rubber I used to dampen the noise. After awhile, it becomes a rather comforting sound. It sounds like "fuel delivery", ha ha. -WG

jutny

is there a convinent place to mount the holley blue?

also, could you give me the part number for the carter so i can compare price...

from summit, the holley blue with regulator, and a holley pressure gauge would come to $122 shipped.

diabolical1

iTrader: (3)

Carter = CRT-P4594 @ Summit

it's about 60 bucks ...

bcty

yeah i installed the pump just need to get the wire crimped down.. but i put the car on the on position.. sounds sweet!.. oh i have a question! when you turn your car to the on postion does it pump fuel to and into the carb? or does it just prime the fuel pump?

diabolical1

iTrader: (3)

i believe on a '79, it should pump the fuel as long as it's in the "ON" position and you used the stock positive wire.

specRX7_22

yes it definately pumps fuel to the carb

--eric

bcty

so if i left it in the on position it would flood the carb?

REVHED

No it shouldn't. The float bowl will fill up with fuel until the float is high enough to close the needle valve and stop the flow of fuel. It can flood though if the needle and seat are worn or if the fuel pressure is too high.

bcty

roger that thanks a lot guys.. so u think 6psi should be fine for racing eh?