Fuel system help - Carb'd 302

[CraKel]

Alright, so finally banged out most of this project in the last week or so at buds shop and was able to get the truck back home safe and sound.

However I got it towed because Im running into a small problem with the fuel system..

I had a Mr. Gasket 12s elec pump and was gunna use that with BadDad's guide on how to wire it and install it properly but decided on another route.

I got hold of a new Holley 12-841 regulator (4.5-9PSI) and used the existing fuel lines and in tank pump from the stock ranger system. I routed the fuel from tank to regulator in - to regulator out - to carb. Return from reg back to return line to tank and hooked up vent line from carb back to char canister and finally to tank.

However! The god damn thing is spitting out WAY too much fuel and flooding the carb and floats. The regulator isnt regulating anything. I know I have this hooked up right but what the hell is going on?

What do you guys think? Return line plugged? Bad regulator?(was brand new in box), or anything else? I bypassed the impact switch and the in tank pump runs fine but I cant keep this thing runnign unless I pinch the line until the gauge reads around 5psi..

Your thoughts please!

 

[CraKel]

And yes Ive tried turning the screw out and in on the regulator to change the pressure.. It was set from factory at 7psi and I know for a fact that ALOT more than 7psi is coming through to the carb.. Also, when I had my old v6 in there starting it would always be a pain in the ass.. I would have to start it and keep my foot on the gas slightly at 1000-1500rpm to keep the thing from bogging out for the first few mins.. Dunno if this has anything to do with it semed like a fuel system problem.

 

[martin]

First thing that comes to mind is some kind of restriction in the return line.

 

[85_Ranger4x4]

Might do a little reading to make sure what the intent of the thing is.

Regulating a lift pump (basically what the 12S is) or a mechanical fuel pump is a little different than regulating a high pressure fuel injection fuel pump.

Otherwise Martin has a good idea checking the return.

The instructions cover a bunch of different ones are are really vauge...

http://holley.com/data/Products/Technical/199R10575rev.pdf

 

[MUDDING B-3000]

im having the same problem with my carb 302 in my 92 ranger, im using the mallory 3 port regulator with the bypass return, n its overflowing my carb a bit to, i just bought a psi gauge to see what kinda pressure is going in to the carb to see.

 

[CraKel]

I wont be able to get to work on the thing till saturday but Ive been thinking about this problem..

Im sure the regulator can handle the 40psi from the efi in tank pump (why wouldn'lt it be able to?) so this wknd Im gunna take the return line and just pump the excess into a bucket or something to see if its actually regulating anything at all or if all the fuel is going to carb even without my stock return line. That should make sure the regulator is actually doing what is supossed to do.

Im told this is the way to go if you want to keep the in tank pump instead of plumbing in a new elec pump.. however the regulator is actually regulating the pressure of the fluid, not the volume correct? So it seems that it may be working but the pumps volume of fluid is too much for the pump. Easy fix, put in a needle valve before the regulator and limit the amout of fuel to carb and/or regulator. However, this puts extreme pressure on the work of the in tank pump and its liable to burn out and die doing this..

What other options do I have? Im gunna phone Holley as soon as I can get through to there tech services and explain my problem to see what they think..

Worst case is I can try plumbing my 12s Mr. gasket pump back into the system but the thing doesnt self prime and is a tricky part to wire up below the tank fuel level, anyone got any suggestions where to go from here?

 

[CraKel]

im having the same problem with my carb 302 in my 92 ranger, im using the mallory 3 port regulator with the bypass return, n its overflowing my carb a bit to, i just bought a psi gauge to see what kinda pressure is going in to the carb to see.

I got a gauge aswell when I realized that way too much fuel was going to the carb and flooding horribly. Next time i cranked it over gauge went off the charts (0-15psi) so theres definitely a pressure problem somewhere..

Im currently in Bradford working mon-fri, once I get this thing on the road a barrie meet might be in the works! If you ever go to the Back Alley Cruisers shows Ill probably be there with them.

 

[85_Ranger4x4]

I wont be able to get to work on the thing till saturday but Ive been thinking about this problem..

Im sure the regulator can handle the 40psi from the efi in tank pump (why wouldn'lt it be able to?) so this wknd Im gunna take the return line and just pump the excess into a bucket or something to see if its actually regulating anything at all or if all the fuel is going to carb even without my stock return line. That should make sure the regulator is actually doing what is supossed to do.

My thoughts are if the regulator is meant to knock like 12psi down to 4 or 5, throwing 40 at it might overwhelm it and force more through it because it can't go to the return easy enough.

I have never delt with a regulator like that so take it with a grain of salt though...

I would put shop air to the return line and make sure it is clear and seeing what it does regulate by draining it in a bucket sounds good too.

 

[CraKel]

Ok so super busy wknd, but I did manage to test the regulator.. When turning pump on ingnition on but not starting it Im able to regulate the fuel as it should do and plenty of fuel comes out return line into bucket.

So pretty sure my problem is stemming from a bad return line, took a look at the fuel filter and it looks good, but its oem so Im gunna get a nice holley billet one from summit. And wherever I read that the return line goes through the fuel filter well thats totally wrong on my year ranger anyways.. just supply running through it.

Also found that my vent line is completely rotten from bout 12" after the char canister so guess im putting a new line in there as well..

Was trying to turn over the engine at the end of the work day and the final kick in the nuts was a bad ground somewhere..Backfired a few times (prolly due to flooding) and then batter completely ran out of juice. Hooked up the trickle tried again and got three attempt to start and ran out of juice again.. fuel level gauge was going crazy (all way full to all way empty) so Im thinkin its a ground from the tank.. Lets hope this is the case and its an easy fix.. Wanna get at least a turn of the crank by next weekend!

Keep ya updated and thx for all the helpful posts.

 

[Tominator]

I read the first post and did not have a suggestion. Your setup is sound. Got to be something simple...

 

[CraKel]

Update, got it fixed this weekend. Looks like the return fuel line was plugged or sheared from the fabric sleeve just after the oem male/female fitting. Weird how they go from a braided steel line to a almost nylon looking sleeve then back to regular metal fuel line..

Either way pressure is constant at 4-5psi and engine runs and sounds great..