Carbs and fuel pump relay, my solution |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Carbs and fuel pump relay, my solution |
hcdmueller |
Feb 2 2009, 03:27 PM
Post
#1
|
????????????? Group: Members Posts: 542 Joined: 4-February 06 From: UK Member No.: 5,527 Region Association: England |
I am running carbs on my 2056 so I performed the simple mod as described by SirAndy in the Tech Articles. One thing I have noticed with my car is that my fuel pump runs continuously with the key switched on. The fuel pump is a rotary one that I bought from the Type4Store.
I didn't like that fact that my pump kept running so I took matters into my own hands. I modified a Bosch CIS fuel pump relay to work with my car. It needs a signal from the negative side of the coil to provide power to the fuel pump. So unless the engine is cranking or running it won't start up the pump. Nice to have the extra safety margin as well. The relays are easy to find in the junk yard. I only paid a couple dollars for 3 of them. Attached image(s) |
DickSteinkamp |
Sep 29 2019, 10:06 AM
Post
#2
|
Senior Member Group: Members Posts: 500 Joined: 27-February 17 From: Bellingham, WA Member No.: 20,876 Region Association: None |
There are (at least) two times you want your fuel pump to stop operating wether you have a fuel injection or carb equipped engine.
1. When you get in an accident. 2. When a fuel hose or line breaks or a fuel hose clamp fails. For the first case, one one of the inexpensive inertia safety switches is a good solution. All cars have been equipped with these since the 1990s. An inertia switch won't protect you in the second case, however. Without some additional device, the pump will continue to dump fuel until the ignition switch is turned off. Adding an oil pressure switch or a the Revolution thingy would work OK for a fuel injected engine. I think the engine would stop pretty quickly with a major fuel line failure due to the drop in fuel pressure. A carbed engine, not so fast. It would run until the fuel in the float bowl(s) was exhausted. Not a good thing. Especially if the fuel being dumped was feeding a fire. I don't know any way around this, however. Ideas? |
Lo-Fi Version | Time is now: 7th June 2024 - 07:32 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |