Loss of fuel pressure on very steep uphill

Engines and Engine Systems
Anthony Forgey
Senior Member
Senior Member
Posts: 209
Joined: 07 Apr 2016 09:46
Full Name: Anthony Forgey
Nickname: Anthony
Home Town: Randburg
Current 4x4: 98 4.2D
Home Language: English
Has thanked: 18 times
Been thanked: 21 times

Loss of fuel pressure on very steep uphill

Post by Anthony Forgey » 06 Nov 2017 20:39

Vehicle is '98 4.2 diesel NA
So I was at Moegatle on the weekend and the vehicle slowly stalled on two separate obstacles while I was attempting to crawl up.

I have done both of those obstacles before without this issue.

I did an oil change service (265k) on Wednesday before the weekend and also replaced the fuel filter.

Something weird happened though....
After putting the new filter in, I couldnt get the thing primed with the manual pump on the filter. I Even filled the new filter with diesel to help it along. Eventually I got it right. This is the 4th time I'm replacing the filter so I have done it before... with ease.

I thought there may be a crack in one of the rubber fuel hoses running up to the filter and down to the pump, so I bought some new hose and fitted it on Friday.

The tank was just over half full while I was on these obstacles.

so... what's wrong?

1. perhaps the manual pump membrane is leaking
2. perhaps there is a perished hose between the tank and the fuel line
3. perhaps the Diesel pump is vrot (I don't think so, it goes fine on the road, no problems...
4. perhaps the diesel pump is just not up to the task(I don't think so, I have done those obstacles in the same vehicle with no issues)

Ideas?...
'98 Patrol 4.2D

Intelligence is measured in smarts, stature is measured in hearts

User avatar
Tinus lotz
Moderator
Posts: 6670
Joined: 29 Aug 2010 13:07
Full Name: Tinus lotz
Nickname: Tinus lotz
Home Town: Centurion
Current 4x4: Nissan patrol 4.8 GRX 2005

Toyota 2.7 legend 35 LWB 4X4
Home Language: Afrikaans
Has thanked: 508 times
Been thanked: 242 times

Re: Loss of fuel pressure on very steep uphill

Post by Tinus lotz » 06 Nov 2017 20:54

Is it a champion feul filter ?

Had the same problem on sat when me and Michael serviced my bakkie filter not sealin lwwkke

User avatar
TijmenvdS
Senior Member
Senior Member
Posts: 158
Joined: 23 Nov 2016 06:25
Full Name: Tijmen van der Steenhoven
Nickname: Tijmen
Home Town: Pretoria
Current 4x4: 1997 Patrol TD42 GQ ST
Chevrolet 1974 K10 402 V8
Home Language: Afrikaans
Has thanked: 9 times
Been thanked: 23 times

Re: Loss of fuel pressure on very steep uphill

Post by TijmenvdS » 06 Nov 2017 21:08

Also had a problem with the champion filter not sealing on my previous service and just put the old one back.
Its not possibly an air restriction problem? That it doesn’t get enough at low rpm but at high rpm forces enough through. :confused:

Anthony Forgey
Senior Member
Senior Member
Posts: 209
Joined: 07 Apr 2016 09:46
Full Name: Anthony Forgey
Nickname: Anthony
Home Town: Randburg
Current 4x4: 98 4.2D
Home Language: English
Has thanked: 18 times
Been thanked: 21 times

Re: Loss of fuel pressure on very steep uphill

Post by Anthony Forgey » 06 Nov 2017 21:26

I just checked... it is a Champion filter....

Previous one was also a champion.... weird...

I'll change it
'98 Patrol 4.2D

Intelligence is measured in smarts, stature is measured in hearts

User avatar
Tinus lotz
Moderator
Posts: 6670
Joined: 29 Aug 2010 13:07
Full Name: Tinus lotz
Nickname: Tinus lotz
Home Town: Centurion
Current 4x4: Nissan patrol 4.8 GRX 2005

Toyota 2.7 legend 35 LWB 4X4
Home Language: Afrikaans
Has thanked: 508 times
Been thanked: 242 times

Re: Loss of fuel pressure on very steep uphill

Post by Tinus lotz » 07 Nov 2017 06:06

Those campion filters are defective .... the top of the steel bottoms out on the housing before the rubber can seat ....

User avatar
Michael
Moderator
Posts: 2467
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 142 times
Been thanked: 228 times

Re: Loss of fuel pressure on very steep uphill

Post by Michael » 08 Nov 2017 06:17

Jip, 100% as mentioned by Tinus and Tijmen.
Thise champion filters are garbage, they actually now stock the full range of GUD filters for the Patrols for me at our local spares shop because of these sub standard other brands.

Will post a pic of the problem
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

Anthony Forgey
Senior Member
Senior Member
Posts: 209
Joined: 07 Apr 2016 09:46
Full Name: Anthony Forgey
Nickname: Anthony
Home Town: Randburg
Current 4x4: 98 4.2D
Home Language: English
Has thanked: 18 times
Been thanked: 21 times

Re: Loss of fuel pressure on very steep uphill

Post by Anthony Forgey » 08 Nov 2017 06:29

I bought and fitted a GUD yesterday, problem fixed. GUD is larger, heavier and better made. I won't use champion again.
'98 Patrol 4.2D

Intelligence is measured in smarts, stature is measured in hearts

User avatar
ricster
Patrolman 1000+
Patrolman 1000+
Posts: 5542
Joined: 13 Jan 2010 11:16
Full Name: Cedric Warner
Nickname: Cedric
Home Town: Alberton Gauteng
Current 4x4: '99 Nissan Patrol 4.2 Turbo Diesel
Home Language: English
Location: LA..... No not Los Angles ..... Lower Alberton, Gauteng
Has thanked: 183 times
Been thanked: 212 times

Re: Loss of fuel pressure on very steep uphill

Post by ricster » 08 Nov 2017 08:41

Good info to know ...Thanks guys !!
Regards
Cedric
Nissan Patrol GL 4.2 Diesel Turbo (Iron Maiden)
Nissan SANI 3.0 V6 4x4 (SOLD)
Isuzu KB 280 DT 2x4 ('ol Smokey) - SOLD
Suzuki TL 1000R "V twin" (Growler) - SOLD

User avatar
Dustin
Patrolman
Patrolman
Posts: 503
Joined: 14 Sep 2009 12:14
Full Name: Dustin Roberts
Nickname: Dustin
Home Town: Port Elizabeth
Current 4x4: Patrol-less :-(
Home Language: English
Location: Port Elizabeth
Has thanked: 43 times
Been thanked: 56 times

Re: Loss of fuel pressure on very steep uphill

Post by Dustin » 08 Nov 2017 09:49

Pretty sure it's a bad seal on the filter.
For interest sake, I had a similar issue with a GUD filter once. Just a bad batch I guess.
Swop it out for another one and see if that helps.
a.k.a. Datsun Dustin

View my Patrol's story here : http://patrol4x4.co.za/viewtopic.php?f=43&t=6478

No hill too steep, no donga too deep !
GO PATROL !!!

User avatar
Michael
Moderator
Posts: 2467
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 142 times
Been thanked: 228 times

Re: Loss of fuel pressure on very steep uphill

Post by Michael » 09 Nov 2017 05:38

Here is a pic with the two filters side by side.
Look carefully at the centre section where it screws on
Attachments
20171108_074128.jpg
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

Post Reply

Return to “09. Engines”

Who is online

Users browsing this forum: Bing [Bot] and 1 guest