Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> CB rotary fuel pump failure, now it runs fine
hydroliftin
post Jan 3 2011, 08:51 PM
Post #1


Member
**

Group: Members
Posts: 378
Joined: 8-November 06
From: Vallejo, CA
Member No.: 7,180
Region Association: Northern California
New Year's day I went on a fun run with PCA. We drove a few hours through the Santa Cruz hills in light rain with the temperature in the 50's. I have a 2.0 liter with webers and the CB rotary fuel pump wired into the stock relay board as per the classics thread. The cover on the relay board is pretty good, I don't think it got wet. Over the course of the fun run I started and stoped the car several times with no problems.

On the way home, driving at the speed limit on Hwy 280 I start to lose power, the engine sputters and then dies. I pull to the side of the road, key the ignition and I can hear no fuel pump. I call the tow truck, and an hour later we drop my car off at the mechanic. I try to start the car again, still no sound from the fuel pump. The mechanic shows up a few hours later and the car starts fine. Monday morning, he trys again, same thing.

Anyone have experience with CB rotary fuel pump failures? Seems to me they are pretty reliable from what I have read. Any suggestions as to what the problem might be?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Jan 3 2011, 08:56 PM
Post #2


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
relay plug clean? wire crimped tight on spade connector? dirty pump fuse ? fuse contacts on relay bd? allways check teh cheap easy stuff first
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mike Bellis
post Jan 3 2011, 09:00 PM
Post #3


Resident Electrician
*****

Group: Members
Posts: 8,347
Joined: 22-June 09
From: Midlothian TX
Member No.: 10,496
Region Association: None
I've had other rotary pumps just stop. re-start the car after a few minutes and run for weeks without stopping again. My guess for mine is debris inside the pump getting wedged and locking the pump. My solution was to replace the pump.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
zx-niner
post Jan 3 2011, 09:21 PM
Post #4


Member
**

Group: Members
Posts: 294
Joined: 13-June 05
From: Las Vegas, NV
Member No.: 4,269
Region Association: Central California
Yes, I had a brand new one seize up in less than 200 miles. Replaced it with a Facet and have several thousand problem free miles.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bobhasissues
post Jan 3 2011, 09:24 PM
Post #5


seemingly endless issues with my 914
**

Group: Members
Posts: 218
Joined: 13-February 07
From: Chicagoland
Member No.: 7,532
Region Association: None
I had a CB pump that out of the box would occasionally not run on start up and other times it would. When it did work it never faltered, but I was never confident that it wouldn't crap out on me while driving. I changed power sources, double grounded it, and even bench tested it about a dozen times. I learned to listen for it to run before I would engage the starter. After a summer of that aggravation I replaced it. No problems with the new one, yet. Someone posted in a related thread a few months back that based upon their experience they replaced their CB (Carter) pump as a preventative maintenance measure every two or three years.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Jan 3 2011, 09:36 PM
Post #6


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
Loosen the clamp... These are clamped around the body in most cases and they exert force on the body, reducing clearance and building heat that leads to the pump locking up..

When it cools down the pump works fine again, until the process starts again once the heat builds again..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scotty
post Jan 3 2011, 09:51 PM
Post #7


The Fun Never Stops
***

Group: Members
Posts: 773
Joined: 20-May 03
From: Portland. Oregon (SW)
Member No.: 718
Region Association: None
Yeah...I'm on my second one. Now I worry.

I'll try facet next time.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jan 3 2011, 10:21 PM
Post #8


Resident German
*************************

Group: Admin
Posts: 42,207
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California
QUOTE(scotty @ Jan 3 2011, 07:51 PM) *
I'll try facet next time.

Order a jumbo sized pack of ear plugs with it too ... (IMG:style_emoticons/default/shades.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomeric914
post Jan 4 2011, 07:26 AM
Post #9


One Lap of America in a 914!
***

Group: Members
Posts: 1,266
Joined: 25-May 08
From: Syracuse, NY
Member No.: 9,101
Region Association: North East States
QUOTE(scotty @ Jan 3 2011, 10:51 PM) *

I'll try facet next time.

I had multiple Facet pump failures before switching to the CB (Carter). The CB pump has been in for close to 10,000 trouble free miles over the past couple of years.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
JoeSharp
post Jan 4 2011, 08:17 AM
Post #10


In Irvine, Ca. May 15-18
****

Group: Members
Posts: 3,947
Joined: 9-July 03
From: DeLand, Florida
Member No.: 898
Region Association: South East States
I use both and have problems with the facet. The CB has given me no grif. When it does I'll put in a bigger Holly.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Jan 4 2011, 08:35 AM
Post #11


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
Facet pumps are horrible.. They create pulsations that the needles and seats hate.
I have had no issues with the Rotary pumps with clean fuel and proper installation, in my old Blue Bug I ran one for 10 years with no problems.

The biggest issue is the clamps being too tight...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ME733
post Jan 4 2011, 08:52 AM
Post #12


Senior Member
***

Group: Members
Posts: 842
Joined: 25-June 08
From: Atlanta Ga.
Member No.: 9,209
Region Association: South East States
..........I have had problems with all of the high dollar rotery fuel pumps over the years., this is not to say they are no good, as they did give good service with accurete fuel pressure....Seems that the rotery pumps have such close tolerances that with even minor debris, such as fuel oxidation particles, etc, the rotors eventually sieze up. I have even had brand new pumps sieze up in just a few hours of use...The facet pumps make a lot of noise, but you cannot hear it with the engine running...they too will eventually fail, by "swetting" fuel and a lowering of fuel pressure as they age. Overall I prefer the facit for street use. A fuel pressure regulator is manditory. The key element to any fuel pump is to SOFT mount it in the chassis. I always used a rotery pump which had a pressure adjustment in the body and a water seperator for racing...as with anything mechanical nothing is forever.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Jan 4 2011, 12:02 PM
Post #13


Engine Surgeon
*****

Group: Members
Posts: 9,398
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
The key to long life with a rotary pump is a few ounces of Marvel Mystery Oil added to the fuel every couple of tanks full..

I have no issues with the Rotary pumps, but I believe in serious fuel filtration with 2-3 filters on every car I own. I also drive the cars all the time, so nothing has time to start giving issues.. Weekend cars breed issues, drive the bitch daily and it'll run much longer and much better!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 9th May 2025 - 10:38 PM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
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 ...