Installing fuel pressure gauge help needed

Post Mon Jan 25, 2016 2:14 pm

Hi

I've been having running issues with my m20b20 prefacelift convertible and have been advised to check the fuel pressure.

Can anyone tell me where and how to connect this in a way I can see it whilst I'm driving. Also what should the fuel pressure generally be around 2-2.5 bar?

Thanks

Post Mon Jan 25, 2016 2:28 pm

If you're using something like this,: http://www.ebay.co.uk/itm/Fuel-Injectio ... SwMmBVw0oz you need to disconnect the fuel hose that goes straight to the injector rail, connect the tee piece to the end of hose, and reconnect the other branch of the tee to the rail, using the short hose and hose clips in the kit. Connect the gauge to the tee, using one of the other pipes in the kit as an extension, if they fit, then tape the gauge to a windscreen wiper, and drive the car with the bonnet open at the back.
Pressure should be exactly what's marked on the FPR at wide open throttle, and half a bar or so lower at idle.

Post Mon Jan 25, 2016 2:30 pm

Brianmoooore wrote:If you're using something like this,: http://www.ebay.co.uk/itm/Fuel-Injectio ... SwMmBVw0oz you need to disconnect the fuel hose that goes straight to the injector rail, connect the tee piece to the end of hose, and reconnect the other branch of the tee to the rail, using the short hose and hose clips in the kit. Connect the gauge to the tee, using one of the other pipes in the kit as an extension, if they fit, then tape the gauge to a windscreen wiper, and drive the car with the bonnet open at the back.
Pressure should be exactly what's marked on the FPR at wide open throttle, and half a bar or so lower at idle.

Thanks Brian. I really need to get to the bottom of this as I've changed nearly everything and ive been working on it for months now

Post Tue Jan 26, 2016 8:42 am

Matt, i have a couple of used fuel rails with pressure regulators in my stash, both from working cars that i fraged some time ago.. for postage and a small donation to the zone your welcome to borrow one and see if that helps.

if your pulling the fuel rail get them injectors over hauled and then at least you can rule them out.

Post Tue Jan 26, 2016 11:33 pm

aimlessrock wrote:Matt, i have a couple of used fuel rails with pressure regulators in my stash, both from working cars that i fraged some time ago.. for postage and a small donation to the zone your welcome to borrow one and see if that helps.

if your pulling the fuel rail get them injectors over hauled and then at least you can rule them out.

Thanks gary,

I'm going too run a fuel pressure check on the fuel rail\engine first to see if I am getting the recommended 2-2.5 bar pressure. So I'll see how I get on with this but grateful for your offer.

I've already fitted new fuel pump, pressure regulator, afm, carried out full service including plugs rotor arm distributor etc.

I'm hoping it's a bad electrical connection to the pump or something simple as there isn't much else left to try apart from the injectors. Otherwise I could. Have a blockage in one of the fuel lines.

I have debated using this as an excuse to put a 2.5 engine in. Although this won't help if bits a tank, fuel pump, fuel line issue.

Post Wed Jan 27, 2016 12:45 pm

What's the issue?

Ben

Post Wed Jan 27, 2016 6:14 pm

BenHar wrote:What's the issue?

Ben

Hi Ben,

Revs dropping off and hesitating when more than 50% acceleration applied or when climbing hills.

The fault seems intermittent and worse at random times. But it never has full power.

Post Wed Jan 27, 2016 8:14 pm

TPS?

Ben

Post Wed Jan 27, 2016 9:53 pm

BenHar wrote:TPS?

Ben

I did consider this and must admit I haven't checked this yet, also wondered if the gasket could be leaking round the throttle body. Apart from a bad connection on the pump, blocked fuel line and bad injectors this is the only other part that hasn't been changed.

I will see what the fuel pressure check reveals on Saturday

Cheers Ben

Matt