Thread: Fuel supply probo....

Originally Posted by Quiggers

Yes it does Ladas, what are you thinking?

GQ

Just getting a train of thought ...................

I think before going there you might want to check the pressure of the system as Dave said.

The pressure should be 2.39 - 2.67 kg/cm2 (33 - 38 psi), with a max pressure drop of 0.7 kg/cm2 (10 psi) in one min

If the pressures are not okay

There are three areas that need to be checked

1. Filter - already done
2. Pump - again as Dave said if it's been try to pump against the blockage this may be the cause
3. Finally pressure regulator

If the pressures are okay then the injectors could well be blocked.

Have you got a gauge to test the pressures ? I can't remember on the D1 - but I think it was a 'tyre size' shreader valve - so you could check it with a tyre pressure gauge (ie guage not just a sliding bar indicator)

Originally Posted by BigJon

It is possible to have good flow without the appropriate pressure to go with it. Hence attaching a pressure guage to the fuel rail.

So what you're saying is to put the pump under load and if it can't cope with said load, then the pump is cactus.....

I've got an auto electrician nearby, a pump for a VN commodore is the replacement?

Thanks for your help.

GQ

If the pump can't generate the required pressure, then it is U/S. While checking pressure, try blocking the return to tank after the regulator. This should give an indication if the regulator is OK.

I have fitted an external VL Turbo Commodore (bosch) pump to my Rangie (no access hole for fuel tank) but I believe a VN pump will do the job for an in tank fitment.

Don't these things always arise on a Friday arvo & the beginning of a LWE.

A thread was posted recently & utemad found a Bosch pump assy only & fitted it with the original gubbins/frame.

Do a search for in tank pumps

Yeah, thanks, 4bee

Appreciate your suggestions, and everyone elses, too'.

A mate has a couple of Rangy Classics sitting under tarps, I'll ring him later and see if he's amenable to me 'borrowing' a pump.....hopefully they're later than 91 RRCs and have the internal type....(and a working one)

This may sound a bit left of centre, but for test purposes only, if I got one of my boat tanks, put, say 20 litres of juice in it turned it on its side, plonked it on the roof and gravity fed it to the fuel line, connecting to the point at the rail, would gravity feed work? or is this a dumb idea? given there are fuel pressure issues......

My reasoning for this is so: if the motor fires and runs being gravity fed, then I've isolated the problem, to somewhere before the rail etc......

(I have a dial face tyre pressure gauge, part of a kit when I bought a compressor from Superjoint a few years ago, but I'm unsure as how to do a pressure test re the pump).

GQ

I doubt gravity feed will give you the required pressure that a pump would deliver (apx. 40 psig I seem to recall ) & therefore will prove nothing. There wouldn't be enough to push through the injectors.


Re gauge. Fit it to the schraeder port & switch on the pump I would think. Someone else may know better though. I've never done it.

Originally Posted by 4bee

Me as well. It's good insurance imho.

Same here - good insurance that you will never need it hopefully
(2 spare filters, one stored in vehicle, one on shelf)

Martyn

Fair enough, I'm not that familiar with pressure systems.

I've figured out how to do a pressure test, if I find the right adaptors, then I'll attach the dial face tyre gauge to the line before the rail.

Thanks.

GQ