Carb motor-EFI fuel pump - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

General Tech Have a question that is not covered by one of the other categories? This is the forum for all other items not specifically covered in other categories.

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 10-16-2002, 18:15   #1 (permalink)
Registered User
 
Join Date: Feb 2002
Location: Aaaahhhuuuuppp The Pub
Age: 31
Posts: 234
Carb motor-EFI fuel pump

Once again I call on the help of the people at FF.

Can someone who knows stuff about running carby fed motors with EFI fuel pumps and not the old mechanical pump help me?

At the moment my setup consists of the standard XB fuel tank, EFI fuel pump, feeding upto a XF Weber carb, motor is an EFI 4ltr out of an EB but running the carb NOT efi.

Is there anything missing in this setup? I dont really want the hassle of a surge tank, but do I need a return line for fuel from the carby back to the tank? Is this possible to rig up on an XF Weber? Do I need to run a fuel pressure regualtor?

I find that Im having trouble starting the car in the mornings and even when it has warmed up. The symptoms are that the car turns over but wont start. Then after a while of frigging about with the accelerator it kind of "choofs" shit back up the carby. Sometimes I see smoke waft out from the air filter! I have also found the air filter holder base (sports filter, that chrome bit) has sometimes had fuel sitting in it, like seriously pooling in it. I have found one way to start the ute is to switch off the fuel pump (by flicking the kill switch) and then once it starts switching it back on.

WHATS GOING ON???

Another thing I have noticed the ute doing is when I back off while driving (irrespective of the revs) I get a lot of small backfiring. Its not a bang just more of a pop/rumble.

I have a theory (could be way off track) that the EFI pump is pushing too much fuel into the carb and is flooding it at start up. Then as Im driving it is still doing it when I back off and dont need as much fuel as when Im accelerating. But I thought that when the float is full the inlet for the fuel would get cut off.

Any ideas guys? Anyone with a carby/electronic fuel pump setup that can explain their system to me?

Thanks,
Simon
__________________
THE ONLY SUBSTITUTE FOR CUBIC INCHES IS FORCED INDUCTION
uteman is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-16-2002, 18:44   #2 (permalink)
Ford Member
 
XR8DAZ1's Avatar
 
Join Date: Feb 2002
Location: Seymour
Age: 46
Posts: 177
Mate , ditch the EFI pump (waayyy too much pressure) as it will be pumping fuel past the needle and seat and flooding your engine.
Get a small (carter?) electric pump and use it with a regulator.
hope this helps
Daz
__________________
XR8 & XR6 OWNERS CLUB OF VICTORIA
XR8DAZ1 is offline   Reply With Quote
Old 10-16-2002, 21:46   #3 (permalink)
Registered User
 
Join Date: Feb 2002
Location: Aaaahhhuuuuppp The Pub
Age: 31
Posts: 234
Cheers Daz

I was just looking at it now before I started the engine. The fuel pump was on and pumping fuel. As you said it was pumping too much fuel and it was just pouring inot the carb, hence the flooding.

Any idea on the price of the regulator? Small pump shouldn't be too expensive I wouldnt think. I might check what brand/type of pump I have at the moment.

With the setup you mentioned Daz, I dont need any return lines or anything do I? It should pump enough for my needs?
__________________
THE ONLY SUBSTITUTE FOR CUBIC INCHES IS FORCED INDUCTION
uteman is offline   Reply With Quote
Old 10-16-2002, 22:31   #4 (permalink)
Shh i'm huntin more power
 
Jase_ELXR8's Avatar
 
Join Date: Jul 2001
Location: Melbourne
Posts: 1,764
You dont really need a regulator if it's just a basic setup. You can by electric pumps for carby cars from repco and burson that just bolt straight up, no other bits needed....
Jase_ELXR8 is offline   Reply With Quote
Old 10-17-2002, 01:41   #5 (permalink)
Registered User
 
Join Date: Feb 2002
Location: Aaaahhhuuuuppp The Pub
Age: 31
Posts: 234
I assumed that my mechanic got one of those pumps for caby cars but he must not have. I can remember seeing the box it came out of and I dont think it was any brand name or anything it just said EFI Fuel Pump. I spose I could always check the flow rate of this pump and get something that is a lot less.

Cheers for your help guys.
__________________
THE ONLY SUBSTITUTE FOR CUBIC INCHES IS FORCED INDUCTION
uteman is offline   Reply With Quote
Old 10-17-2002, 04:08   #6 (permalink)
Registered User
 
Join Date: Jun 2002
Location: queensland
Posts: 1,134
Quote:
Originally posted by uteman
I spose I could always check the flow rate of this pump and get something that is a lot less.
It's not the flow rate you worry about, it's the pressure. If you put a low pressure regulator in the line after the pump and bridge the return line back to before the pump you won't have to run a full length return line. Check specs on carb input pressure for regulator set pressure.
__________________
If you're not driving a manual you're really just steering.
WBT56 is offline   Reply With Quote
Old 10-17-2002, 05:02   #7 (permalink)
Registered User
 
Join Date: Jan 2002
Location: brisbane
Age: 48
Posts: 617
The XF weber should have a return line connected to it at the same fitting as the inlet line.As for using the EFI pump from what i've seen it is almost impossible to cut the pressure down enough to run a carb..
I did see someone try out a holley reg with an f100 efi pump and it didn't work on a carb,the reg made all sorts of strange noises.. Just go with a basic electric pump...
gregaust is offline   Reply With Quote
Old 10-17-2002, 05:38   #8 (permalink)
Australian BA XR6 Falcon
 
Join Date: May 2001
Location: Perth WA
Posts: 1,249
Just a suggestion, but would a carby XF fuel pump fit into the older tank? must be heaps of em around and cheap as chips - grab the return lines too.

What sort of dizzy is it using? I would have thought you would have had to go back and use an XF carby computer/dizzy arrangement, could be that the back off popping is related to some sort of timing issue?

Kieron
Kieron is offline   Reply With Quote
Old 10-17-2002, 16:16   #9 (permalink)
Registered User
 
Join Date: Feb 2002
Location: Aaaahhhuuuuppp The Pub
Age: 31
Posts: 234
WBT56: I get it now, its got to much pressure so it pushes fuel past the needle and seat as DAZ said. Wouldnt it be better to plumb the return line to the tank and not the line before the pump? Would the fuel heat up if it wasnt plumbed back to the cool fuel in the tank?

Kieron: So did the carby XF's have electronic fuel pumps? I thought they would have had a mechanical one? As far as I know it runs (I think) and XF dizzy. Its an electronic one with an orange dizzy cap. Can you tell what its from?

gregaust: I have no idea where the return line is at the carb! There is an outlet on the front right which is identical to the inlet on the front left. Is this it? At the moment there is no "barb" to connect a hose to.

Cheers
Simon
__________________
THE ONLY SUBSTITUTE FOR CUBIC INCHES IS FORCED INDUCTION
uteman is offline   Reply With Quote
Old 10-17-2002, 16:54   #10 (permalink)
mmm..Vee 8
 
Join Date: Jul 2002
Age: 31
Posts: 496
Uteman...the Carby XF's run a Carter mechanical pump, which orignally was located on the passenger side of the engine, operated of one of the rockers.

According to the gregorys XF manual...the fuel delivery pressure of the carter pump at idle is 48-56kpa.

The EFI XF's ran electronic in tank pumps...with the station wagon having a both a high pressure and low pressure pump as well. They are rated at 250kpa idle fuel pressure.

The unleaded XF's run a eletronic dizzy off an EST system...but mine has a black dizzy cap...dunno if the color means anything though...your cap might be a different brand to the original bosch part?

Hope this helps

Extreme
__________________
First Ever Car - '84 XF Fairmont Ghia....Big Luxo Tank, Just Gotta Love that Velour!
Previous Ride- '87 XF S Pak...Now Retired with 305,000 on the clock!
Previous Ride-'99 AU Falcon S,Got sick of the 6...Need a V8!

5/1994 ED Futura Classic 5.0 in Polyneisan Green - One of the last ever built
Extreme_2020 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > General Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
No juice @ fuel Pump. 93' Probe GT MikeP General Tech 2 06-13-2003 02:39
XE Fuel pump probs Chris5ltr General Tech 0 05-04-2003 08:35
Fuel pump noisey - 1997 EL wagon FordPrefect General Tech 3 12-23-2002 04:29
BA Falcon Engine Reveal RPO83 Ford Worldwide News 0 09-04-2002 08:27
Ford Product-Led Transformation: 2003 RPO83 Trans | Driveline 0 07-22-2002 07:48

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 22:08.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.