problem 75

Submitted: Sunday, Feb 24, 2008 at 18:51
ThreadID: 54884 Views:1432 Replies:8 FollowUps:5
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hi everybody
Q: i have a 75 series ute 4.2 diesel i want to know if anybody has had problems with the primer pump for the fuel filter,can they kick the bucket and suck air through the pump.
cause when i go to prime it wont draw fuel through the filter so the ute wont run and when i do get it going it runs good for a few hundred kms then coffs and splats and dies,i have checked all the fuel lines and i cant see any leaks or splits for it to be drawing air. i just cant seem to solve the problem

any advice will be taken on board
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Reply By: Wayne (NSW) - Sunday, Feb 24, 2008 at 19:18

Sunday, Feb 24, 2008 at 19:18

Could be a blocked filter.

If there was a split or leak fuel would be around the leak and it would stick out like a sore thumb.

AnswerID: 289158

Reply By: Member - Axle - Sunday, Feb 24, 2008 at 19:22

Sunday, Feb 24, 2008 at 19:22
Hi Brentos, pain in the neck those sorts of fuel problems, Sounds like a fuel pick up problem at the tank end to me, Especially if it runs for that sort of distance then plays up, might be worth pulling the pick up out of the tank & see if you can spot something?. Good luck.

Cheers Axle.
AnswerID: 289160

Reply By: brentos - Sunday, Feb 24, 2008 at 19:34

Sunday, Feb 24, 2008 at 19:34
hi guys

thanks for your insight.the fuel filter is brand new,just before christmas i did a service on the ute and i thought i would change the filter it was running fine before that but since then it has been nothing but trouble i even got another filter incase it was faulty but to know avail and now it is stuck on the front lawn, i got it going for about 30 seconds and it died again,i will look into
the pickup i dont really know what i should be looking for though.

AnswerID: 289164

Follow Up By: Member - lyndon K (SA) - Sunday, Feb 24, 2008 at 19:59

Sunday, Feb 24, 2008 at 19:59
main or secondary filter replaced? I think secondary is every 10k and main 20k
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FollowupID: 554487

Reply By: brentos - Sunday, Feb 24, 2008 at 20:05

Sunday, Feb 24, 2008 at 20:05
it it was the main the other one looks pretty original,but it fine before i changed the main one

thanks brentos
AnswerID: 289173

Follow Up By: Malleerv - Sunday, Feb 24, 2008 at 20:31

Sunday, Feb 24, 2008 at 20:31
Have found that if you hit the primer pump button on the top of the filter housing with the palm of your hand a few times quickly and firmly that it will start pumping. I suspect the valves get stuck open from lack of use. If you seals on the filter are ok you should not have any problems.

Cheers Matt
FollowupID: 554500

Reply By: Member - Doug T (FNQ) - Sunday, Feb 24, 2008 at 20:54

Sunday, Feb 24, 2008 at 20:54
I never use the pump , fill the 2 filters before you fit them , In fact I have restarted mine twice now over the years I've had it on the starter , don't take long, This came about because I forgot to turn the tap that allows the fuel to gravity feed into the main line between the tank switch over solenoids and the main filter, and when you have a 120 tonne + truck following about 1k behind there's no time for stuffing around.

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AnswerID: 289188

Follow Up By: brentos - Sunday, Feb 24, 2008 at 21:12

Sunday, Feb 24, 2008 at 21:12
thanks guys ill give it a try i even had a go at disconnecting the fuel line before the first filter and tried to suck fuel through but i got nothing just air
FollowupID: 554514

Reply By: Member - Hughesy (NSW) - Sunday, Feb 24, 2008 at 21:29

Sunday, Feb 24, 2008 at 21:29
Brentos, I've had 2 x 75's and they both used to take about 3-4 minutes (have to swap hands a couple of times!!) of pumping to get the fuel thru. Both had over 200k on them so maybe the hand pump was a bit tied.

Keep pumping for about 5 pumps after it goes firm too and this "seems" to get any air out of the system because mine have always started first crank and run smoothly after a filter change.

A couple of tips.

1. Yes you can crank the motor to get the fuel up but remember the injector pump uses the diesel as a lubricant so I'd advise against that method unless you were in a hurry.

2. Change the primary smaller/cheaper ($7ish) filter every 5k and the main filter every 10-15K. Just remember to change the rubber seal in the top of the housing of the primary filter. Its best to remove the whole filer housing to do this unless you have a rubber neck.

3. A check to see if you hand pump is working is to take the inlet hose of the secondary filter and put you finger over it while obvioulsy should suck hard against you finger.

4. As others have said make sure all your hose clamps are tight (replace the Toyota ones with worm drive clamps) and ensure the fuel hose hasn't gone hard/brittle.

Good luck mate the 75's are a great truck.
AnswerID: 289204

Follow Up By: brentos - Sunday, Feb 24, 2008 at 21:54

Sunday, Feb 24, 2008 at 21:54
hi hughesy

thanks for the tips i have taken everybodies advise on board
and i will start with the easiest thing first just hope i can sort it out
thanks to everyone for the help
FollowupID: 554522

Reply By: Member - Davoe (Yalgoo) - Sunday, Feb 24, 2008 at 22:26

Sunday, Feb 24, 2008 at 22:26
Youve got an air leak somwhere. contrary to what was stated just coz air can get in doesnt mean diesal can get out.
I had the problem with a lister genny and It had a glass bowl which enabled me to see the air graduaklly acumulating in the filter which eventually stopped the motor but it toomk a while.
I fixed it by tightening every unuin between pipes that carried diesal i could find
- this is where i would start if i was you
AnswerID: 289222

Follow Up By: Member - Davidp P (VIC) - Monday, Feb 25, 2008 at 20:45

Monday, Feb 25, 2008 at 20:45
is the fuel pump in the tank?, if not the low pressure supply side hose may be de-laminating and blocking the flow
FollowupID: 554658

Reply By: brentos - Monday, Feb 25, 2008 at 21:27

Monday, Feb 25, 2008 at 21:27
no the pump is not in the tank its in the engine bay
not sure what you mean with the delaminating hose and what should i look for

regards brentos
AnswerID: 289380

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