I have a 78 Bronco with a 351M 400 6.6 Liter. I want to replace my mechanical fuel pump with an electric one. can I just re-route the fuel line to a pump on the fire wall and leave the old one in place, or is there some type of adapter plate I can mount on the block to replace the manual pump? I believe the cause of my engine vapor locking is my fuel pump and I could use the security of having an electric high flow pump.
2007-12-23 13:36:21 · 13 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Had the same problem with my 79 400 bronco. The cause was the metal line that ran from the fuel pump to the carb. It ran along the front of the intake manifold and wold vapor lock periodically. I just slipped a piece of rubber fuel line over the metal one for insulation. Some people clip 4or 5 wooden clothes pins on it to dissipate the heat. You could use the clothes pins to see if that solves the problem, and then go through the trouble with the rubber hose. If you go through with the electric fuel pump, i would buy a blank off plate for the current mechanical fuel pump location. This will eliminate the extra drag of the fue
l pump lever and the extra weight and engine bay clutter. Most aftermarket fual pumps have instructions for installation So just follow the instructions for carburated engine. I also like to install a inline fuel pressure gage for future help with diagnosing problems.
2007-12-23 14:06:44 · answer #1 · answered by sonnie_b 4 · 1⤊ 0⤋
Electric Fuel Pump Conversion
2017-01-03 11:34:04 · answer #2 · answered by ang 4 · 0⤊ 0⤋
Manual Fuel Pump
2016-10-05 01:13:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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RE:
How do I convert a manual fuel pump to an electric one?
I have a 78 Bronco with a 351M 400 6.6 Liter. I want to replace my mechanical fuel pump with an electric one. can I just re-route the fuel line to a pump on the fire wall and leave the old one in place, or is there some type of adapter plate I can mount on the block to replace the manual pump? I...
2015-08-06 06:55:28 · answer #4 · answered by Anonymous · 0⤊ 0⤋
If you want to install an electric pump you must bypass the manual one. The two in line will make too much pressure and overcome the float in the carb to flood your engine.
It can be left in place if it isn't making noise, or some people remove it and cut the arm off of it and reinstall it.
An electric pump will usually cost more than a manual one.
Also some are not as reliable as the manual ones.
Hope this helps
2007-12-23 13:49:39 · answer #5 · answered by Bert from Brandon 5 · 0⤊ 2⤋
Yes, you can use the electric and still leave the manual in place, just cap off the line at each end.
Now, for the vapor lock, I doubt if the fuel pump is the reason for vapor lock, as it's usually caused by the gas line being too close to a heat source. like the exhaust manifold, so maybe just re-route the gas line and be done with vapor lock.
Any gas line wil have vapor lock if too close to any really hot part of the engine or manifold, electric or manual.
2007-12-23 13:47:09 · answer #6 · answered by Anonymous · 0⤊ 0⤋
"Manual" means "operated by hand." So you mean "mechanical," rather than "manual."
You just need to learn how to work with tubing, so you can fabricate new tubing to replace the factory made fuel tubes. For sure get rid of the old mechanical pump. You can buy or make a cover plate for the slot. Be sure to have a well-sealed gasket under it, too.
Then mount the electric pump in some convenient and mechanically workable location, and wire it into the accessory bus so it will run when the key is on.
Have fun!
2007-12-23 13:49:02 · answer #7 · answered by aviophage 7 · 1⤊ 1⤋
Thats pretty much all you need. Best to mount elec pumps below fuel tank level, and as close to tank as you can get. You can plumb it pretty much with any line you want too. IIRC the threads in the pump is 3/8" NPT pipe threads You can get a hose barb for that and just run rubber fuel line to it, or you can run flared steel/alum hardline, or you can go with braided line Best to wire it up using a relay Also its nice to wire in and hook up an oil pressure safty switch to elec fuel pumps. I knew a guy that lost his car due to fire from forgetting to switch off the elec fuel pump when he shut the car down. The oil pressure switch installs in the engine (an oil port like the oil pressure gauge does) then you wire the pump to that switch and if oil psi goes under 5 psi it shuts the pump off
2016-04-02 12:54:19 · answer #8 · answered by Anonymous · 0⤊ 0⤋
You can leave the old one in place or get the cover plate, it doesn't matter much, What does matter is that you don't overpressurize the line to the carb. It only requires about 2 psi. Any more will get forced past the needle and seat valve and overflow your float bowl. Also electric pumps are anything but reliable. I replace them all the time at my shop.
2007-12-23 13:50:45 · answer #9 · answered by BFH 6 · 0⤊ 2⤋
Leave original in place install electric fuel pump to bracket and bolt in place might have to predrill run covered two strand wire 14 guage is good enough run to front one wire to ground or switch and second wire to ignition hot should do the trick wire diagram can be found on line. hook up fuel lines and install heat shield if ness to help with vapor lock prob.
2007-12-23 13:53:09 · answer #10 · answered by WAYNE C 2 · 0⤊ 2⤋