Hello, I have a 1986 dodge w250 with a 360. i have a stalling problem when it gets hot or when you try to drive up an incline. the cooling system is in good condition. I think the problem I have is vapor lock, the truck will stall within 2 to 5 miles of driveing. The engine has a weiand aluminum intake and holley 670 street avenger carb, also headers. I installed a holley electric fuel pump to combat this problem and also removed the thermostat in hopes of running cooler. If you start driveing up a hill it will stall like its out of gas,wait a minute cycle the pump and it starts back up. this continues to happen, 4 times in a mile. I also tried a coil and ignition module, and theres nothing blocking fuel, I had the tank out. Please help !

 

Put the Tstat back in as over cooling is not a solution.

You need to make sure the float is set correctly? Or the float could be sticking.

 

I had a similar problem with a B100 Van.. The fuel hoses at the tank needed replaced. Was sucking more air than gas...

 

Thanks, i realize that now as I had no result. The carb floats are correct, went through them as well as needle and seat. all good. I installed a 1 inch spacer under the carb as well with no result. When it stalls the bowl is dry, no fuel squirts from the accelerator pump. this is driveing me crazy !

 

It is a fuel DELIVERY problem, Try replacing all the rubber fuel lines that are on it as was stated try it and THEN report your findings/problems.

Also where did you mount your electric pump? AND change the fuel filter(s) AFTER you replace the hoses.

 

Like other's have said, it sounds like a fuel delivery issue. on a side note - Do you have a pressure regulator after the pump? I know that Holey carbs only like 4-6psi of fuel.

Make sure that the electric fuel pump is away from anything that is hot (ie - exhaust), have filters after the tank and between the pump/regulator and carb, all the hoses are in good shape and replace those with any cracks in them.

 

Ok today i installed a glass sight filter and discovered that there was very little flow. I tracked it back to the electric pump and took that apart. It was clogged solid with sand ! Can I use a glass sight filter before the electric fuel pump ? Also, the pump is factory set for 7.5 psi, do i need a return ? Thanks

 

Good fix. Glad you found it.

I don't use glass anywhere in the system. You can use transparent plastic before the carb and after the pump but I dont like glass. Just a preference thing.. Im sure many folks have no issues. You can use a generic filter before the pump but use metal and make sure you plumb it where you can service it.

They are supposed to be pre set but I have found most to be a little heavy on the needle. I always run the 20 dollar regulator and an inline fuel pressure gauge.

 

The electric pump is pre-set to 7.5 psi? I've never heard of that before (doesn't mean it doesn't exsist though). Since you are running all Holley parts, I would talk to rickyr as he is a Holley tech and may be able to give you the best insight as far as what pressure should be going into the carb from the pump.

Great catch on the sand though. Like PK1 mentioned, install a filter before the pump and after the pump. Since you found sand in there, I would drop the gas tank and clean it out completely and flush all the fuel lines. Last thing you want it to get any sand in the carb/motor.

 

These are the two I use. I do use large rubber washers when I mount or create a rubber pad for them them as they can create some harmonics if mounted to a solid surface. I set my starting pressure around 5.5. I have never had a pump failure.


From my literature in house.

ELECTRIC PUMPS
Holley offers a complete line of electric in-tank and externally-mounted pumps.
Holley externally-mounted electric fuel pumps are also available in various flow
ratings. The “red” pump, P/N 12-801-1, is rated at 97 GPH and it is designed
to work with stock or mildly modified engines. Pressure is pre-set to 7 PSI and
a regulator is not required. The “blue” pump, P/N12-802-1, is rated at 110
GPH and it is designed for street/strip applications. Pressure is pre-set at 14 PSI
and a regulator is included as part of the package. Neither pump is compatible
with methanol or alcohol fuels nor should they be used with fuel injection systems.
The “black” pump, P/N 12-815-1, is rated at 140 GPH and is designed
to work with either gas or alcohol fuels. This one is similar to the “blue” pump
but it kicks out more fuel. These pumps all feature a simple, yet rugged, rotor
and vane design which has proved itself over the years.

 

Thanks for the info guys, I have the holley red pump mentioned in your post. I am going on vacation, I will get back at it in a week or so.

 

I installed a clear fuel filter before my holley red fuel pump, it is mounted vertical and when the truck is running the filter is not full it is just about empty. Why is this, should I mount it horizontal ? Any suggestions please

 

I've always mounted them with the pump on the top and the lines running horizontally. Not sure if it makes a difference though. Did you replace the fuel lines going back to the tank? Are you sure the pickup in the tank isn't clogged with sand/dirt?

 

The pump gravity feeds from the tank to take a prime. The silver base plate must be lower than the base of the tank to be optimal. And the base plate should be horizontal to the ground.