And Now the Fuel Pump :( - Suzuki Forums: Suzuki Forum Site
Suzuki Forum Suzuki Forums

» Auto Insurance
» Featured Product
Wheel & Tire Center

Go Back   Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowAuto LoansInsurance Advertise

Suzuki-Forums.com is the premier Suzuki All Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 07-23-2010, 03:20 PM   #1 (permalink)
Expert
 
alternator's Avatar
 
Join Date: Apr 2009
Location: Saudi Arabia
Posts: 448
Gallery: 4
alternator is on a distinguished road
Default And Now the Fuel Pump :(

Ok, guys, I know I'm wining a bit after my 1.6L engine swap, please bear with me.

When I attempted the swap, I purchased the adapter plate and low pressure fuel pump from Low Range Offroad. Ever since the engine swap, the fuel pump has been making this ticking noise. I had it hooked up to the starter switch, so I went and hooked it up to a relay and gave it power directly from the battery, but the ticking did not go away.

Today I was driving the Zuk to the dunes, and my fuel pump just stopped working. Aparently I had a defected fuel pump, but I do have some questions:
1. Does the fuel pump require a pressure regulator?
2. If the fuel pump is hooked directly to the carb, where will the excess fuel go? I didn't do the installation myself, so I'm not sure if it is going directly to the carb or through some regulator.

Please help!
alternator is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 07-23-2010, 06:05 PM   #2 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

some pumps are internally regulated. most inexpensive ones require an external regulator. There should be a fuel return line so that anything the carb can't use gets diverted back to the tank.
Baratacus is offline   Reply With Quote Quick reply to this message
Old 07-24-2010, 12:20 AM   #3 (permalink)
Expert
 
alternator's Avatar
 
Join Date: Apr 2009
Location: Saudi Arabia
Posts: 448
Gallery: 4
alternator is on a distinguished road
Default

Quote:
Originally Posted by Baratacus View Post
some pumps are internally regulated. most inexpensive ones require an external regulator. There should be a fuel return line so that anything the carb can't use gets diverted back to the tank.
Ok, what are the steps required to do after a carbed 1.6L engine swap regarding the fuel pump? What is the required pressure of the fuel pump? Can I get an old GM fuel pump and use it on the Samurai?
alternator is offline   Reply With Quote Quick reply to this message
 
Old 07-24-2010, 12:01 PM   #4 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

If you do a quick search on the forums for it I'm sure you'll turn up a couple topics. Seems like we were discussing it at length a couple months ago and there's a bunch of usefull information in that thread.
Baratacus is offline   Reply With Quote Quick reply to this message
Old 07-26-2010, 04:26 PM   #5 (permalink)
Expert
 
alternator's Avatar
 
Join Date: Apr 2009
Location: Saudi Arabia
Posts: 448
Gallery: 4
alternator is on a distinguished road
Default

Hay, guys, good news. Ain't no problem with the pump, it was just disconnected from electricity.

I got down there tonight to remove it and claim a warranty on it, but I found the red cable disconnected. I connected it back and there it went.
alternator is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 02:10 PM   #6 (permalink)
Expert
 
alternator's Avatar
 
Join Date: Apr 2009
Location: Saudi Arabia
Posts: 448
Gallery: 4
alternator is on a distinguished road
Default

Now the pump really did die. I checked all electric lines, and they are all fine. I removed the pump. I made a search on the forum and most threads talk about the high pressure pump, none give details on low-pressure ones. I'm getting a new fuel pump, so I still need to know two things before I get it:
1. The pump was connected without any filters, before or after the pump. Could that have caused the pump to die after just several usages and less than 50 miles?
2. Do I need a fuel regulator? If so, do I need a one with a return line or without a return line?

Please help guys.
alternator is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 09:38 PM   #7 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

samurai needs a low pressure high volume pump. The stock pump puts out about 6psi. You need between 4 and 8, don't go over 8 and don't go under 4. If your pressure is unregulated and too high the pump will unseat the needle valve in the carb.

You need a return line before the regulator. That way any fuel held back by the regulator can be diverted to the tank rather than loading up the fuel pump.

You need a fuel filter before the pump to avoid particulates going through the pump and damaging it. Particulates won't kill a pump but it will reduce it's efficiency.

What kills a pump is excess loading on the electric pump motor, either with excess backpressure, or excess draw pressure.
If you didn't have a return line that could have been causing a lot of backpressure which would dammage the valves on your carburetor and would burn out the pump motor.
Things that cause excess draw pressure are clogged in-line filters, clogged or restricted supply lines, or a malfunctioning tank vent.
Baratacus is offline   Reply With Quote Quick reply to this message
Old 07-30-2010, 10:35 PM   #8 (permalink)
Moderator
 
Join Date: Mar 2009
Location: Georgetown, Guyana
Posts: 11,958
Gallery: 0
fordem will become famous soon enough
Default

What needs to be determined here is what sort of pump is being used, and what the manufacturer of that pump recommends.

I've been using electric fuel pumps for over two decades, and that includes installing them on cars that originally had mechanical fuel pumps, and not all of them require return lines.

Some of them (notably SU pumps as fitted to the classic Minis) also tick during normal operation, others don't, it depends on the design.

Also, whether or not you need a fuel pressure regulator will also depend on how much pressure your particular pump can deliver and how much the carburettor needs - if a return is required with your particular pump, where it connects will depend on the regulator.

Just as an example, one of my Suzukis is carburetted, has a low pressure, high volume, "in tank" pump, has no fuel pressure regulator and has a return line - tee'd in to the delivery line just before the connection to the carb - and this, by the way, is the factory setup - the only things that have been changed are the fuel filter (located outside the tank, after the pump by the way) and several small diameter rubber hoses.

Last edited by fordem; 07-30-2010 at 10:38 PM.
fordem is offline   Reply With Quote Quick reply to this message
Old 07-31-2010, 12:15 PM   #9 (permalink)
Expert
 
alternator's Avatar
 
Join Date: Apr 2009
Location: Saudi Arabia
Posts: 448
Gallery: 4
alternator is on a distinguished road
Default

The fuel pump I got from Low Range Offroad and it is a universal one. It clearly said in the manual that the fuel pressure regulator is optional.

Ok, all that brings up one more question: How to hook up a return fuel line back to the fuel tank in the Samurai, which is not designed for a return fuel line? Anyone has done it?

Second question: How does the return line junction? Is it only a T-junction before the carb like fordem described, or must it be through a pressure regulator that has a return line in it? How difficult or easy is it?

I have a feeling my pump really didn't need a pressure regulator, but was overwhelmed with the backpressure. Just a feeling. So probably if there is a way to have a return line without buying a pressure regulator, it might solve the problem.

Last edited by alternator; 07-31-2010 at 12:21 PM.
alternator is offline   Reply With Quote Quick reply to this message
Old 07-31-2010, 12:40 PM   #10 (permalink)
Veteran
 
Join Date: Jan 2008
Location: San Diego, CA
Posts: 1,230
Gallery: 0
Baratacus is on a distinguished road
Default

Never seen a carbureted samurai mechanical pump that didn't have a return line off the pump. (Of course I've never seen an in-tank electric pump on a stock carbureted samurai either)
If the vehicle used to have a mechanical pump at one time or another, then you should have a line from the tank that's been blocked off. Should be 3 hard lines coming into the engine compartment: supply, return, and vent.
If the vehicle used to be Throttle body injected and had an in-tank pump then you could just run a return line.

As far as the regulator goes, if its a low pressure pump rated at under 8 psi then there isn't a need for a regulator. With no regulator in-line, you just put a "T" fitting in the fuel line between the carburetor and the fuel pump.
Baratacus is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  Suzuki Forums: Suzuki Forum Site > Suzuki Models > Suzuki Jimny, Sierra & Samurai Forum

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Suzuki Forums: Suzuki Forum Site forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Insurance
Please select your insurance company (Optional)

Log-in



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

Posting Rules
You may post new threads
You may 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


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:49 PM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.