| Slant Six Forum https://mail.slantsix.org/forum/ |
|
| Electric fuel pump https://mail.slantsix.org/forum/viewtopic.php?t=62358 |
Page 1 of 1 |
| Author: | crickhollow [ Thu May 17, 2018 9:21 pm ] |
| Post subject: | Electric fuel pump |
If I fit an electric fuel pump to my 61 Valiant, do I stiil need to keep the mechanical pump going? Where is the best position to fit the electric fuel pump? How do I wire the electric fuel pump so it turns off if my engine suddenly stops - like having an accident? |
|
| Author: | Badvert65 [ Fri May 18, 2018 4:12 am ] |
| Post subject: | Re: Electric fuel pump |
No, you will not really need the mechanical pump. Electric pumps are 'pushers', so it is best to mount them in the rear near the fuel tank. There are numerous electric fuel cut off switches available. They connect to oil pressure (you can run a 't' fitting at the oil gauge/light pressure sensor). Basically, when the engine stalls, oil pressure drips with it cutting the electrical feed to the fuel pump. note: depending on the pump you use, you may need a fuel pressure regulator to keep from flooding the carb. -Matt |
|
| Author: | Joshie225 [ Fri May 18, 2018 12:21 pm ] |
| Post subject: | Re: Electric fuel pump |
#1 best position is inside the fuel tank. You can retrofit an oil pressure switch and an inertia switch which will kill the fuel pump if the oil pressure drops or the car is hit, respectively. Unless the car vapor locks or the original fuel pump is unavailable the mechanical pump is almost always simpler and cheaper. |
|
| Author: | emsvitil [ Fri May 18, 2018 7:14 pm ] |
| Post subject: | Re: Electric fuel pump |
I use an electric pump as a primer pump. It's only on temporarily to prime the carb after it's been sitting awhile (or when I'm really low on gas to make sure I can make it to the gas station) It's mounted next to the tank above the axle. |
|
| Author: | Badvert65 [ Sat May 19, 2018 6:46 am ] |
| Post subject: | Re: Electric fuel pump |
Quote: Unless the car vapor locks or the original fuel pump is unavailable the mechanical pump is almost always simpler and cheaper.
I have used both and I definitely agree.-Matt |
|
| Author: | crickhollow [ Sat May 19, 2018 5:35 pm ] |
| Post subject: | Re: Electric fuel pump |
I like Ed's reply for my circumstances. How is this setup done and work? For example, if the pump only pushes fuel to prime the carbie prior to ignition, I assume it is then (manually) switcted off. When it is off does fuel still flow through the electric fuel pump to the carbie after ignition? Thanks, Peter |
|
| Author: | emsvitil [ Sat May 19, 2018 6:29 pm ] |
| Post subject: | Re: Electric fuel pump |
It's a facet style pump. Fuel flows thru it when it's off. Manual on/off. You can get fancy and build a simple circuit with a relay and a large capacitor so it runs for 30 seconds when you first turn on the ignition or ACC circuit. Mine is on the ACC circuit, so that you can prime without the ignition being on. |
|
| Author: | crickhollow [ Sat May 19, 2018 6:57 pm ] |
| Post subject: | Re: Electric fuel pump |
Thanks Ed. I think I will go with this approach. Peter |
|
| Author: | '67 Dart 270 [ Thu Aug 02, 2018 12:33 am ] |
| Post subject: | Re: Electric fuel pump |
I have an electric pump, no mechanical pump. I use an inertial cutoff switch (Ford type) and I have a toggle switch cutoff as well under the dash. I have an LED under the dash that goes on if the inertial switch cuts off so that I know. Yes, nearer to the tank, if not in the tank, is best. B |
|
| Author: | wjajr [ Thu Aug 02, 2018 4:59 am ] |
| Post subject: | Re: Electric fuel pump |
Why the need for an electric pump? If there no air leaks between pump diaphragm & tank, pump will stay primed. What usually happens, carb bowl dries for whatever reason: leaking by into or onto manifold; evaporation after extended non use; or boiling from heat soak, Perhaps pump cam on camshaft is worn, or pump has reached its useful life where internals are old and degraded, or both. |
|
| Author: | FrankRaso [ Thu Aug 02, 2018 9:03 am ] |
| Post subject: | Re: Electric fuel pump |
What is the reason that you believe you need an electric fuel pump? If you only need to prime the mechanical pump, you can also set it up to only run when the starter is engaged and this would be easy to with relays, especially if you're also going to do the HEI upgrade. I have a list of suitable electric pumps here: Vapor Lock. You can get good relays from SSDan: Daniel Stern Lighting |
|
| Author: | Ron Hamby [ Thu Aug 02, 2018 6:17 pm ] |
| Post subject: | Re: Electric fuel pump |
I just installed an electric pump above the tank on a 1986 Ram this week. The mechanical pump would not pull the fuel from the tank after it sat without running for a week or two unless I put gas in the carb to get it running then it would begin working. The mechanical pump is new and pumps great on the work bench. So now I just hit the electric switch for a few seconds and that is all it needs. It works great. I know the carb is leaking down after a few days, I dont know why the mechanical pump dont pull the gas with the starter unless the cam lobe is badly worn which it shouldn't be because it only has 79k on the engine. The electric pump was the easiest fix. |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|