Volvo Community Forum. The Forums of the Volvo Owners Club

Forum Rules Volvo Owners Club About VOC Volvo Gallery Links Volvo History Volvo Press
Go Back   Volvo Owners Club Forum > "Technical Topics" > S40 / V40 '96-'04 General

Notices

S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

Information
  • VOC Members: There is no login facility using your VOC membership number or the details from page 3 of the club magazine. You need to register in the normal way
  • AOL Customers: Make sure you check the 'Remember me' check box otherwise the AOL system may log you out during the session. This is a known issue with AOL.
  • AOL, Yahoo and Plus.net users. Forum owners such as us are finding that AOL, Yahoo and Plus.net are blocking a lot of email generated from forums. This may mean your registration activation and other emails will not get to you, or they may appear in your spam mailbox

Thread Informations

New fuel pump in 2.0 Turbo - now won't start

Views : 541

Replies : 6

Users Viewing This Thread :  

Reply
 
Thread Tools Display Modes
Old Nov 19th, 2018, 20:32   #1
nickar
Junior Member
 

Last Online: Nov 17th, 2019 14:43
Join Date: Nov 2018
Location: Chester
Default New fuel pump in 2.0 Turbo - now won't start

Hi,

I just joined the forum so thank you in advance for helping a new member. I'm a decent amateur mechanic but have an issue that requires a little more knowledge.

My Volvo V40 2.0T (2001) recently went into the garage because there was a large puddle of fuel forming under the rear seat ie. on top of the fuel tank.

I bought a pump that was the same size as the old one, fits perfectly and connects fine with the plug and pipes but different model number (it was a good price). Before the new pump was the fitted, the car started fine (but was leaking fuel from the old pump). Just in case it matters, there is an after market LPG conversion but that never caused issues for running on petrol or starting. I have disconnected that system for now to eliminate it from the equation.

After further investigation, the fuel gauge works and the new pump appears to pumping fuel so it does not seem to be a connection issue. However, when I disconnected the fuel line in the engine and pointed it into a bottle instead to watch the flow, the following happened:

- A small amount of fuel went into the bottle at relaxed rate (less than you would expect) when the ignition was turned to the stage just before starting
- When the engine is started, it then starts to pump fuel again but seems a little weak and staggered

The above explains why the engine is not starting I think. There just isn't enough fuel coming through. However, I cannot figure out why the pump is doing that.

As I said, the pump fit but it is the wrong model. Could that be the cause? I thought something as simple as a fuel pump would either work or not at all. The two options I have now are 1. making the new pump work or 2. writing it off and getting the correct one. Option 1 would be cheaper but I don't know if it's possible!

The model my car should have is:

09751409900

The model fitted is:

09750409906

Thank you.
nickar is offline   Reply With Quote
Old Nov 19th, 2018, 21:33   #2
difflock54
Junior Member
 

Last Online: Sep 29th, 2021 12:35
Join Date: Apr 2015
Location: Wellington
Default

Check the fuel pressure at the Shraeder valve on the fuel rail.
it should be around 44psi.
difflock54 is offline   Reply With Quote
The Following User Says Thank You to difflock54 For This Useful Post:
Old Nov 20th, 2018, 02:29   #3
nickar
Junior Member
 

Last Online: Nov 17th, 2019 14:43
Join Date: Nov 2018
Location: Chester
Default

Quote:
Originally Posted by difflock54 View Post
Check the fuel pressure at the Shraeder valve on the fuel rail.
it should be around 44psi.
Thank you. I will pass that information onto the mechanic as he has the car. I suspect the reading is going to be too low based on what I saw coming through that pipe.

Bearing in mind that he has fitted a pump with the wrong model number (under instruction from me), is it common for Volvos (or any car really) to have this issue with a pump that has the wrong model number even if it physically fits and connects?
nickar is offline   Reply With Quote
Old Nov 20th, 2018, 21:37   #4
clarkey1984
Premier Member
 
clarkey1984's Avatar
 

Last Online: Apr 13th, 2022 10:41
Join Date: Jul 2014
Location: Beccles
Default

Unsure on whether the same applies to the 2.0t, but I have seen t4 discussions in the past where it was mentioned how imperative it is to ensure that the exact correct pump is used.
__________________
02 V40 T4 S, "Sargent silver" she's back!
clarkey1984 is offline   Reply With Quote
The Following User Says Thank You to clarkey1984 For This Useful Post:
Old Nov 21st, 2018, 11:21   #5
nickar
Junior Member
 

Last Online: Nov 17th, 2019 14:43
Join Date: Nov 2018
Location: Chester
Default

Quote:
Originally Posted by clarkey1984 View Post
Unsure on whether the same applies to the 2.0t, but I have seen t4 discussions in the past where it was mentioned how imperative it is to ensure that the exact correct pump is used.
I suspect it'll be the same then. It's weird with a pump being such a simple device! Thanks for the advice.

Regarding the previous comment, it's nowhere near that pressure level so definitely not working properly.
nickar is offline   Reply With Quote
Old Nov 22nd, 2018, 00:13   #6
canis
Non Fragile
 
canis's Avatar
 

Last Online: Oct 13th, 2023 06:46
Join Date: Apr 2010
Location: Chadderton, Oldham
Default

It's not a simple device. It needs to be able to self-prime when dry, achieve pressure, not fall apart with contact with petrol, not catch fire, not wear out through friction, not leak ... it's quite a lot to ask. It's no simple impeller!
canis is offline   Reply With Quote
Old Nov 22nd, 2018, 01:22   #7
nickar
Junior Member
 

Last Online: Nov 17th, 2019 14:43
Join Date: Nov 2018
Location: Chester
Default

Quote:
Originally Posted by canis View Post
It's not a simple device. It needs to be able to self-prime when dry, achieve pressure, not fall apart with contact with petrol, not catch fire, not wear out through friction, not leak ... it's quite a lot to ask. It's no simple impeller!
I get that and was not underestimating the great engineering of any car part. However, it ultimately has a very basic purpose which is to pump fuel from a tank in through one pipe and back out through another to the engine. I don't understand how any of what you mentioned would affect the basic purpose of a pump. It was not sending enough fuel to power a 50cc moped. The fire protection etc shouldn't make any difference.

Anyway, I bought a secondhand one with the correct code based on advice above so will have to sell the new pump on to someone who has the correct car! Either that or if it sounds to anyone like I have been sent a dodgy pump, I'll just send it back.
nickar is offline   Reply With Quote
Reply


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

Forum Jump


All times are GMT +1. The time now is 14:30.


Powered by vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.