Hey Guys,
My 1971 2.0 Runabout is having some major over fueling problems. The eccentric cam lob is worn down so I can't run a manual fuel pump. The car came to me with a brand new electric fuel pump installed, but it seem to be to powerful. My spec say that I need 3.5 to 5 psi and all the universal electric fuel pumps either have 1.5 to 4 psi or 5-9 psi...local auto parts guys say the smaller one will not be powerful enough and will starve the engine and the larger one is to powerful.
Would a in-line adjustable style fuel regulator work OK?
Has anyone had this same problem ?
Any one ever use a in-line regulator ?
O'reillys sells a in-line regulator made buy MR gaskit for $35. I have never used one but have sold 6-8 never herd any thing back on them. It just has 5 diffrent setting. it is UN clear what psi the setting are. but I think I would give it a try.
Hello Jamie Plastic,
At the sugestion of Turbopinto72 I added a regulator to my Turbo 2.0. Fuel milage raised and my Pinto ran better.
Thanks Brad...
If you replace the Aux Shaft you can go back to the mech. pump.
Should take 1/2 day or less to do it...
From Pintony
IF you use an electric pump, you SHOULD use some sort of a safety cut-off; you never know....
Bill
I have used electric fuel pumps before. It doesnt matter what the output is its just you need a regulator between it and the carb to keep it down where the carbs inlet needle can shut off the gas flow. And on the subject of safety, I also ran a "mercury switch". All you need is to put a T fitting in the block and you can put the stock sending unit or gauge end on one side and the mercury switch on the other and wire the hot wire of the fuel pump through it. When the oil pressure drops to a set point it cuts off. You can wire the pump to run on the starter side of the switch for starting and then the mercury switch will take over in the run position. It actually saved me a race motor in the garage once. I changed the head by myself one night and I changed the oil and fired it up and was timing it and it quit. I cut the switch off and got to looking and found it was out of fuel at the carb. Then I looked down and saw about 5 or 6 quarts of oil in the floor under the motor! When I changed oil filters the old o-ring stuck to the block and when i put the new one on they cocked each other to the side and it blew all the oil out at the filter! I wouldnt have caught it in time since I wasnt in the car and wasnt looking down so Thanks to it I fixed the filter and filled it back up and it saved me about 1500 bucks for another bottom end! Hope this helps.
Jamie Plastic,
For the long term I would just return the system to a stock mechanical fuel pump.
High_Horse
I had an '86 Mustang convertible V6 with what appeared to be a very powerful electrical fuel pump. You could hear that thing hum in the tank at all times.
I am not sure if this is a common setup, but this pump ran full-out all the time sending fuel to the engine. On its way there, it would get close to a hot component of the engine. Whatever fuel it did not need returned to the tank.
If you ran this car on the highway for hours (where fuel consumption is low and there is a lot of heated fuel going back to the tank), the fuel in the tank would warm up. I imagine as the tank got low on fuel, it got even worse, as there was less and less fuel to absorb the heat.
So now you had a quarter tank of very hot fuel, and you hit traffic. Speed went down, and cool air would stop flooding the engine compartment. Guaranteed vapour lock every time. It always seemed to happen in the most dangerous places.
It did have the factory cutoff switch in the trunk, so it was definitely born with an electric pump. I just don't know if it was the original fuel pump. I bought the car when it was 7 years old. I suspect a weaker pump would have been better, as it would have returned less fuel to the tank (therefore less heat).
I would be weary of putting in an oversized fuel pump. I say go back to mechanical.
Quote from: oldcarpierre on January 22, 2008, 10:06:08 PM
I had an '86 Mustang convertible V6 with what appeared to be a very powerful electrical fuel pump. You could hear that thing hum in the tank at all times.
I am not sure if this is a common setup, but this pump ran full-out all the time sending fuel to the engine. On its way there, it would get close to a hot component of the engine. Whatever fuel it did not need returned to the tank.
If you ran this car on the highway for hours (where fuel consumption is low and there is a lot of heated fuel going back to the tank), the fuel in the tank would warm up. I imagine as the tank got low on fuel, it got even worse, as there was less and less fuel to absorb the heat.
So now you had a quarter tank of very hot fuel, and you hit traffic. Speed went down, and cool air would stop flooding the engine compartment. Guaranteed vapour lock every time. It always seemed to happen in the most dangerous places.
It did have the factory cutoff switch in the trunk, so it was definitely born with an electric pump. I just don't know if it was the original fuel pump. I bought the car when it was 7 years old. I suspect a weaker pump would have been better, as it would have returned less fuel to the tank (therefore less heat).
I would be weary of putting in an oversized fuel pump. I say go back to mechanical.
I had an '88, same issue with stalling when hot. Here's the scoop...In-tank fuel pumps on mustangs that are loud enough to hear inside while running need replacing, replaced mine 2 times in the 224k I owned the car, same stalling problem occurred after the 1st replacement . Replaced Fuel regulator, problem solved. Recirculating fuel back to the tank prevents vapor lock and keeps the fuel system cool as it's not sitting still next to the exhaust or something and boiling.
I'm pretty sure the smaller fuel pump will work just fine as long as the flow is good. They used to label the low pressure "American" and the high "Imports". In my opinion buying the high pressure is not needed + adding cost for a regulator + cutting and splicing = 1 more thing to go wrong.
Thank you to all of you.
I put an in-line fuel regulator on it and it was running fine at first than it started to do the same stumbling like it was over fueling, So I decreased the regulator no help. but it did seem to smooth out with a little pressure on the gas pedal, So I adjusted the curb idle and put the regulator back to were it said to and now it runs smooth, BUT I have yet to test drive it as my roommates mercedes project is in the way......I will let you know, but so far so good...no gassy smelling black smoke out the back...lol.... Oh, BTW my electric fuel pump in not inside my gas tank
How is your electric pump working out now? I just finished converting my Pinto to an electric pump and it's running great so far. It doesn't idle rough after the car stops and between shifts seems a little smoother too.
Had same problem with daughter's car. I thought new carb. was bad so they gave me another 1 same prob. instaled fuel reg. adjusted to 2.5 or 3 psi.. Drove down hywy. at 115 mph. had enough fuel and was ok at idle. Fred :) :fastcar: