Holley 4160, or edelbrock carb?

I can add that a couple weeks back i installed a 6 to 9 psi electric fuel pump on an engine, it leaked like a mfer and kept flooding the engine, the carb was rebuilt with new needles and seats....i replaced the 6 to 9 with a 3 to 5 and the leak quit...

horkn wrote: The psi from the new marine fuel pump is 8-8.5 psi.

DA never listen keep waisting effort. Stick a weight on the float while your getting all wet there standing in the wind.

horkn wrote: Yeah, that did fix the fuel coming from the primary venturis. It does idle nicely now, and when I rev it up it runs well too, but under steady throttle above like 1000 rpm or higher, it does still dump non atomized gas through the primary venturis, making it not run totally smooth. Shouldn't the gas be a little better atomized at all times?

I think you have solved the problem, you could try lowering the float a tad more, but then try some steady run at 2500-3000rpms to see if it's not too low.

same old same old got all the answers all ready sorry your still having issues and waisting money.


My friend that's pretty decent turning wrenches fought and fought a miss at higher RPM, changed this that spent a lot of money chasing it, he finally found the issue after he replaced the brand new fuel pump about a grand later, his was a volume issue, he fixed the pressure and leaking carb with the regulator long ago.

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let's see how you do today and then we'll start checking that pressure regulator/volume thing.

horkn wrote: Tornado waarnings and crazy rain. I actually had to hang out in the basement We are all good though.

Cedarburg or Tomahawk? Nothing really through 3L's today!!

Luchog wrote: Pete, how much longer or wider (I.D.) would the fuel hose need to be in order to drop some pressure from the pump to the carb?

Luciano,
The I.D. would need to be smaller and the length needed would be quite long. There's not much flow so there's not much restriction. Even a 1/16" I.D. wouldn't restrict it much. Plus, restriction would be constant at different flows. It's why regulators are used. They adjust to different flows.

Well, I took her to the lake today. It idled great in gear, and unfortunately due to all the rain we have received in the past week, no wake speed was all that was permitted on the lake today and for a short amount of time until the level goes down.
So, after about 10 laps around the lake, and a couple beers, I attempted to get it a little above just engaged in forward speed and it died. All 3 times it died, so I think I need to adjust the accelerator pump. I will look up exactly how to do that. It doesn't die on the trailer, but then again there is no load when not in gear, and not in the water.

Luchog
gap between accelerator pump lever and throttle bracket accelerator pump actuating screw should measure 0.15

I think you mean .010 inch, not more than 1/8 inch ?

Thanks guys!!!!

I will adjust it today:) I don't know when I will be able to test it out on the lake, but once it's adjusted, it should be good to go.

One odd thing I have noticed. The fuel pressure has come down to 5 psi on this new fuel water separator filter. It was at 8-8.5psi when first installed. I put a little over 2 hours of run time on it yesterday. The last one I had on lasted only a week or so and went from the 8-8.5 psi down to 2 psi after about an hour of run time.   
I have the old filter, but without cutting it open, I can assume it was filled with debris. Hopefully this new filter does not get any more plugged, because at least that's one way to regulate pressure, huh?

I'm thinking of adding a clear in line filter before the fuel water separator so I can see when or if the filter is getting clogged. Also, the replacement elements for those are much less $$ than the spin on separator filters.

Back from the boat.

The accelerator pump was way off. when the throttle was wide open, the arm had no play in it. I adjusted it to the .15 gap as per holley's youtube video, and per Luciano's instructions.

next, for the heck of it, I checked to see what nozzle the AP circuit has. It was a 25, so I think that is what it is supposed to be.

The fuel pressure is back to 8-8.5 psi, although the filter is the same one I just put on that was reading 5 psi while idling around the lake for a long time the other day.

Gas does not come out of the venturis at idle, but a little raw non atomized gas goes through when the throttle is pushed up from idle. It wants to stall if I don't open the throttle more quickly.

Here is the pic of where my float is adjusted to. There is not much free play before the float turns off the needle valve, but it can easily do 2500 rpm or more for a couple minutes, or until my tub of water runs out and the hose can't keep up.


Where is this "level" where the float is to be set at? The bottom when it is flipped upside down, is that supposed to be level with the flat side of the bowl?

I will order the fuel pressure reg from summit tonight, and it will get here soon and I can have it on by mid week, and ready for a test on Wednesday or Thursday.

I have 2 important questions though.

1. can I simply mount the regulator off the pump? I see some regulators say that they work best when mounted as close to the carb as possible, but that just won't make mounting it easy, and I would need to have 2 sections of brake line with double flare ends to make this work that way. Would it work ok if I mounted the regulator off the pump, and turned it down to say 5.5 psi or so?

2. What size of NPT do the brake lines for use as fuel lines have? The regulator is 3/8" NPT, and the new marine fuel pump I have is 1/4" NPT, just like the stock one. I plan on putting the fuel pressure gauge inline right after the regulator before the carb so I can monitor psi whenever. I am sure between napa, and the hardware store I can find the fittings to adapt and tee the line.

Bolt the regulator and see how you go. Maybe like Chris friend you get it done.
My take is you might, but you shouldnt need it, my opinion is that something else is off and the regulator may just hide another issue.

float being low isn't going to cause a flooding issue or the needle being blown out of the seat causing gas to spew into the carb's throttle body.

Ok, I got around to installing the regulator today. It's a Holley 4.5 psi- 9 adjustable reg. I had to go from the 1/4 NPT on the pump to the 3/8" NPT on the regulator, because almost all the regulators are 3/8" NPT. Anyway, I got it hooked up, with the psi gauge inline.

As it was set from the factory, the reg was at 6 psi.

The dripping resumed immediately, even though psi had gone down from as high as 9 psi to the 6 psi.

I then attempted to turn down the pressure to see if that would stop the dripping. Nope, no dice.

I took a short video of the dripping even at 4.5 psi.


So, what do you guys say now? The spin on filter is new, and the gas is fresh, and the tank looks clean. The pressure test to the power valve and the needle and seat passed on both. Also, I adjusted the gap for the Accelerator pump the other day. It was WAYYY off.

I do start my new job Tomorrow, so there is some good news at least.

Thanks,

Tom

Yeah, the regulator wasn't the issue, but I still feel that some people may have issues from DIM selling a pump that puts out a good amount more than what is supposed to be supplied by the only pump they sell for a PCM 351W.

Yes, I still have the Holley auto pump, and the weak stock PCM AC delco pump.

This issue started before I put the new DIM pump on however.

I don't think putting the newer holley pump on will help, but I could.

No, I have no extra metering block to try. Do these need to be replaced from time to time? I know if they get dirty, they might have issues with not delivering enough fuel, but it shouldn't make it get too much gas.


Also, after I shut the motor down, it spilled even more gas down the throat through that venturi until the pressure died off in the line. Now the boat is on a slight angle to the side of the carb that is dripping. That might explain the only side getting that much raw fuel is the port side.

Thanks Luciano. It's been a long time coming to get back into my profession since the lay off. This Buyer job really is a great one.