Monaro Fuel Pump

[super coach]

I recently took my in-tank fuel filter out in my VZ Monaro and replaced it with a new one. After about two weeks of having done the work I went to start the car and noticed it took a lot longer to start, cranked for about 7 secs before starting (abit like the old cast iron V8s or when there is no fuel). I thought maybe because I was parked on a slight incline.

I have been monitoring the fuel pump every time I start it (as I never start the car straight away I wait for the pump to build up its pressure) and I notice that when I get a strong low sounding buzz I know the car will start straight away. When I get a high pitched buzz from the fuel pump I know it will take longer to crank. It almost sounds like it is not priming to full pressure. The pump also sounds as if at times it fizzles out before it actually is primed. It seems to fluctuate in how it operates but if I leave the car for more than 30mins then try to start, I get the problem of it not firing properly.

Am I safe to say that my pump is on the way out and I just replace it with a new one from Holden’s? In driving its fine, never misses a beat doesn’t fill sluggish, just seem to have the problem on start up.

[FITZY777]

Hey mate..if I was you i'd be gettin my money back on this one..http://www.ls1.com.au/forum/showpost.php?p=1941262&postcount=1

I do 25k a year in mine (yeah no sunroof to burn my head) and to get to the point of pulling out an in-tank filter..

Put it back and give it back to Holden to fix..ive chatted to many people in SA & Aust/USA, our cars arent just a commy when ya try to get bit's n pieces on the cheap to maintain..watch them when you say VZ Monaro while they are looking in their 'trade price' book, they will then have to move to the computer and make something up for the price !!

PM me if you want the details of a good HSV mech in Adelaide..or just look up Clem.

Cheers mate.

Fitzy

[super coach]

Thanks fitzy but don’t remind me of my post which you so kindly shared a link too haha have changed the Trans fluid so all good now no probs, even did the diff oil, I learnt it was the convertor locking and unlocking. The fuel well I know I need to pump another 10 litres to make her full from when the nozzle starts clicking. Sunroof well its going back for the 5th time to sunroof city. The steering well it’s the power steering cooler which vibrates so am working on fixing that. I’m anal about my car and care for it and it seems I have problems, but it probably relates backs to that I’m picky and fussy which doesn’t help haha.

I did the in tank filter myself with my mate whose a mechanic for a well known jaguar/landrover service centre, so I have learnt abit already on how to do stuff to my car, but somehow think the pump hasn’t liked it and has started to play up

[super coach]

if its not the fuel pump causing the issue, can anyone else explain as to why the fuel is not reaching the engine in time when cranking?

[nikvyss]

I'd say it would be the pump but I know the ba/f xr8s had same problem which was the pressure regs and sometimes the injectors

[350VZ]

Aren't the pump & filter an all in one setup on the VZ's? Replaced mine with a new one when I installed my blower and ever since, at start up, it's not nice. No other issues though... On a side note, I can't get more than 50 litres into my tank from empty... pissing me off???? JUST A TAD!!!!!

[super coach]

Yes i just replaced the filter on mine just uncliped it and clipped the new one on. then it started playing up about two weeks after doing the job. its strange the pump works fine when driving, which means its pumping it in ok but for some reason just doesnt like start up. i dont want to start thinking if it is causing any damage by cranking longer because the fuel isnt there in time.

does anyone know if you have to reset anything when taking the in tank filter/pump out?

on a side note i can get 64 litres into mine as i normally use about 63 litres on one tank

[ice57l]

id be rechecking what you have done and or touched... on most of those setup with the filter in the tank you sometimes have to move or touch the pressure reg which is also in the tank... if you havent clicked it back in correctly or the oring is split or torn it will bleed the fuel back to the tank , how long it takes is how badly its damaged... as its a dead head fuel system it takes time to get the fuel back up there, seem it on toyota and subaru aswell . deff not the pump.

[Tre-Cool]

how was the original filter? dirty etc.

might be worth just replacing the pump.

[abi]

Sorry to butt in on your thread but i'm about to do a filter change on a VZ Monaro too and am wondering what the proceedure is? Does the tank need to come out?

[super coach]

abi

I did mine myself and I would say its a big job. boot carpet out, fuel brace out, unplug high pressure fuel line under neath. you will probably break the clip so buy yourself a new one. make sure you have your tank empty as possible. then you have to lift your tank out, make sure you dont break the plastic lugs where the fuel lines clip on otherwise you will be stuffed and need a new tank.

once the tank is out you gotta then unscrew the lid on top and pull the whole assembly out. the filter in the curved plastic piece at the bottom not the stariner at the end of the pump which is what i thought.

but now im in the problem of the car cranking over for to long bevause something has gone astray with delievering the fuel pressure to the engine. when i get a chance will try and post up some pictures of mine.

p.s dont take it to a dealer as they kinda told me when i was buying parts for mine that they would tell the customer they would do it, but wouldnt really do it as its a big job........:argue::flipoff::kneel:

[abi]

Cheers Super Coach.

[super coach]

Hey guys, as I posted above not to long ago I was having issues starting my car & thought it was the pump. Well after more investigating I have found if I try to start the car in park it will take about 5-8 sec of cranking before the engines turns over, sometimes I have to let go of the key cos I don't want to keep cranking incase I ruin the starter motor.

Now here is the BUT

if I have it in neutral the car will start every time on time no matter whether I turn the key straight away or wait for the pump to finish priming.

The car is an 05 VZ Monaro with the 4 speed auto.

I'm baffled & would appreciate any help/advice/suggestions

[abi]

Well I guess that rules out any problems you thought were caused by the filter change. Might be an issue with the neutral safey switch or might be caused by the BCM, im not sure.

[super coach]

where would i find this switch? as i dont understand why it wouldnt be sending fuel to the injectors when i park. perhaps its thinking its still partly in reverse??

how do i find out whther i have the latest software for the trans and ECU/BCM. Would it be worth getting everything reflashed???

[Peter B - CV8]

where would i find this switch? as i dont understand why it wouldnt be sending fuel to the injectors when i park. perhaps its thinking its still partly in reverse??

how do i find out whther i have the latest software for the trans and ECU/BCM. Would it be worth getting everything reflashed???

Dodgy auto switch will stop car from cranking over. Am I right in saying your's is cranking over - but just not firing straight away in P (but fires straight away in N) ??

[super coach]

yep your spot on Peter. the only thing i will add is when i park i can hear the pump start priming strong but then fizzle out towards the end, where as in neutrual its a strong priming sound all the way through.

where do i find this switch?

[super coach]

well i reckon its been about 2 months and the saga continues, still no closer to finding out what it is. to my post above, its not the switch in P or N as it must of been just a fluke of some sort. I have even been flicking the key to to start so all lights come on the dash and the pump primes before starting. have been doing this 3 times with mixed results. seems if i leave the car for more then 30mins then i still get the excess cranking, amd starting to thinkmaybe the angle car is parked, or perhaps its a crank ange sensor? i havent chnaged the pump as i have no isses with it drivin, nor up steep hills or windy roads.

can anyone tell me what Psi pressure the fuel system is run on in the 5.7L? I have also added 3 videos, two which are the excess cranking, it only does it slighty but i have had it cranking for 10 secs without firing and the other which is how it should start evey time which it used to do.

IMG 5717 - YouTube (http://www.youtube.com/watch?v=DTQIgx4d5Cg&context=C2f765ADOEgsToPDskJOW7N_ilUfaKgLeyZkGVzi)

IMG 5718 - YouTube (http://www.youtube.com/watch?v=Nht48z54naE&context=C2fdedADOEgsToPDskI5xR9fS76MeVcmp5byGZHR)

IMG 5721 - YouTube (http://www.youtube.com/watch?v=t8Oq_DlkvvA&context=C2f59dADOEgsToPDskJA4toQBTl2_krAH9SMhwmg)

[JezzaB]

58psi and the pump has a check valve in it to hold pressure when the car is stopped.

Doesn't give a pop out the exhaust sometimes when it won't start and your cranking does it?

[super coach]

no, doesnt pop at all on starting/cranking, only sometimes when i rev it to hear the sweet sound of a V8 :)

[super coach]

im ring my holden dealer tomorrow and asking them if i can bring it in to have it hooked up to the tech2 and see if any faulty sensors come up or if there is a new firm ware or to reflash my ECU. cos its starts when it wants to start but when driving doesnt throw up any problems.

does anyone know what the normal charge is for getting the car hooked up to the tech 2 and possibly getting things reflashed?

[edelbrock1]

Supercoach... PM me, I may be able to help with your issue.

[edelbrock1]

Aren't the pump & filter an all in one setup on the VZ's? Replaced mine with a new one when I installed my blower and ever since, at start up, it's not nice. No other issues though... On a side note, I can't get more than 50 litres into my tank from empty... pissing me off???? JUST A TAD!!!!!


My car does the same thing. But my issue is a fuel sender problem. I fill the car full and then after about 20 mins of driving, the gauge drops to 3/4 full, when I know damn well that the thing is still full. The gauge then works like normal until it reads empty. If I fill it up when it says it is empty, I only get 50 litres in it. But I know that there is still 20 litres left in the tank. One day I will get around to changing the sender unit, but it is a huge job and not one that I can be bothered with at the moment.

So this could be your issue. Next time you fill your tank, watch the fuel gauge like a hawk and see if it drops 1/4 of a tank instantly at some stage. If it does then you know you have the same issue as me and your tank is not really empty and there is still 20 litres lurking in there somewhere

[super coach]

edelbrock have sent you a PM. You dont happen to work for a Holden Dealer do you?

[Au Phuk Dup]

Fuel Pump Kit Assembly Installation - WARNING

During reassembly of this fuel pump assembly it is IMPORTANT to correctly fit all
the O-Ring seals as shown in the diagram below, to prevent any fuel and pressure
release from fuel connections. Any incorrectly fitted seal may create low fuel
pressure causing poor vechicle performance and possibly hard starting.

[white lie]

4-5 year thread bump for that?

[LS1 Tonner]

4-5 year thread bump for that?

But for anyone searching for this info it is vitally important.
They are the supplied instructions for reassembly word for word

[white lie]

I'd have thought when replacing anything (especially in the fuel system) that you refit the O rings where there meant to go?

[IJ.]

I'd have thought when replacing anything (especially in the fuel system) that you refit the O rings where there meant to go?
Nah I always put mine on the Coilpack bolts ;) <sarc>

[Micks]

Might be something to do with Aotearoa!