has anyone tried one of these so car will start after sitting for a few days?69 6-bbl M code.car runs very good after a couple shots of gas in carb.

The fuel pump has check valves in it.

I have the same problem. So does everybody else. A check valve won't solve the rapid evaporation of modern gas. An electric fuel pump is the only real solution that i am aware of.

A friend sent me this picture of what he did to improve starts after sitting for days. A marine squeeze fuel bulb. I guess it works great...

Yes it is fuel today . . . have found that the non-ethanol blend fuels last longer in the carb bowl - usually 3-4 days on my Sport Satellite. Minute I put in ethanol blend crap, after sitting for a day, you have to crank and crank it to fill the bowl and then it will start. Either an electric fuel pump to prime the pump/carb bowl before starting, or crank crank crank . . . heck, I even tried a check valve like you suggested - no difference ! Not sure if the marine prime bulb would hold up over time - heat, etc . . . but a novel idea . . .

As stated above, the modern fuel evaporates quickly, especially when percolating on a hot intake manifold. I ran a priming bypass circuit on my "oil pressure dependent" fuel pump 12v circuit.

I can hear the bowls fill up after it sits for a few hours and even more so after a few days. The boat priming bulb seems like a good alternative for those who only want to run a mechanical pump, but I would certainly keep it away from heat, inspect and replace it as needed.

Someone else suggested this a couple of months ago and people jumped all over him. Interesting how the same question gets different responses from time to time.

I wouldn't have a rubber bulb filled with gasoline in the engine compartment, like the responses from last time.

I favor the simple but direct solution of the electric fuel pump replacing the mechanical sucker.

R.

me too ! no squeeze bulb near the engine, just an electric fuel pump. there are electric pumps available today that enables you to get rid of the mechanical pump, and with a return line, vapor lock is a thing of the past.

That looks scary to me. Spring a leak and gas on the ex manifold. Yikes!

Those priming bulbs must be Coast Guard approved to use them in boats, but I've never researched it. Maybe one of the members on here knows.

Pretty sure CG approval doesn't included it being in near proximity to a hot exhaust manifold. Aren't boat manifolds water cooled?

Any suggestions as to what is a pump that some people have tried and works with the factory mechanical pump, also maybe one that requires the least amount of BS to install. Part numbers would be a great help.
Thanks

Any electric pump used as a startup booster must have the ability to be "draw through" IOW, it must allow fuel to be drawn through it when shut off; not all will do that. Some here have recommended the Facet FAC-40109.

If you want to run the electric pump all the time as a booster, just about any low-pressure pump will work as long as the volume matches or exceeds the mechanical pump.

I DON'T GET IT!

Why oh why would you want to leave the mechanical pump in your system? It serves no purpose besides looking stock and acting as a junction for the fuel lines.

The only thing separating the fuel from the crankcase is the pump diaphragm.

People get all het up about electric fuel pumps, like they're some kind of voodoo or black magic. A carbureted street car needs one Carter P4070 mounted near the gas tank. It supplies the right pressure for a carb. They are also available from Spectra Premium and one other brand.

Here's the Summit page:
https://www.summitracing.com/parts/crt-p..._content=Carter

If it is wired to get hot with the ignition, you turn the key to "on" for a few seconds before starting. The pump fills the carburetor and then when you crank the engine it starts.

R.

Right. But they are not under pressure in a marine application. They are located on the suction side of the fuel pump.

The rubber deteriorates over time marine or not. I had one on my outboard I replaced recently due to cracking.

Good point. The photo was unclear as to which side of the mechanical pump it was on. It looked like the suction side given it's location, but as mentioned above, keep it far away from heat. It sure didn't look like it was far enough away from heat where it was shown.

The addition of some additional fuel line could easily keep it away from heat, and regular inspections should help keep things as safe as a marine application.