RV8 3.5 injector hoses
Discussion
Early RV8s had fuel injectors with a short length of hose to join to the fuel rail.
The top of the hose (onto the rail) is secured with a hose clamp but the bottom (onto the injector) looks to have nothing securing it just a metal ring that looks to be just a trim for the end of the hose.
So, is there anything securing the hose and can I replace them as they are pretty old?
Steve
The top of the hose (onto the rail) is secured with a hose clamp but the bottom (onto the injector) looks to have nothing securing it just a metal ring that looks to be just a trim for the end of the hose.
So, is there anything securing the hose and can I replace them as they are pretty old?
Steve
Steve_D said:
Early RV8s had fuel injectors with a short length of hose to join to the fuel rail.
The top of the hose (onto the rail) is secured with a hose clamp but the bottom (onto the injector) looks to have nothing securing it just a metal ring that looks to be just a trim for the end of the hose.
So, is there anything securing the hose and can I replace them as they are pretty old?
I've had similar in the past, on a Cit CX. Fairly standard way of doing things back in the 80s. They're crimped on, and should be replaced as part of a proper injector refurb. Don't think they're easily DIY-replaceable, though.The top of the hose (onto the rail) is secured with a hose clamp but the bottom (onto the injector) looks to have nothing securing it just a metal ring that looks to be just a trim for the end of the hose.
So, is there anything securing the hose and can I replace them as they are pretty old?
I've used these guys in the past - with very good results, although for injectors without the hoses. They give a price for "hose-type injectors", which I'd guess refers to these.
http://www.injectorcleaning.co.uk/faq.htm
Posted this on another forum:
"Have a read through this - appreciate its Jaguar.
http://www.jag-lovers.org/xj-s/book/EFIhoseclamps....
Covers the type of injector also found on the RRC EFi where there is no clamp at the bottom of the hose on the injector but what looks like a small cup - referred to as a dished washer in the link. This is what it is, it isn't clamped onto the hose. There are only clamps at the fuel rail end.
Done this job on mine - 1986 3.5EFi - & this is what I did.
You will need to remove the plenum & ram housing. No need to remove the injectors but I did disconnect their electrical connectors to give a bit more room.
I removed the old hoses by the soldering iron method outlined in the link although I used it to cut into the side of the pipe - used the same thing to release the top end of the hose where it joins the steel pipe. Makes life much easier getting it off & doesn't risk damage as using a knife could although may take a bit longer.
Put the cup onto the injector then pushed the new hose - 5/16" - over the barbs & into the cup.
Refitted the fuel rail, clamped it all up using proper fuel hose screw clamps (not the worm drive type) & tested for leaks prior to refitting the ram housing & plenum. Easy to test with a flapper as you just need to turn the ignition on & push the flap open to start the pump.
ETA. There is a small throttle spring which holds the two parts of the throttle spindle in contact that you need to detach when removing the plate (held on with two bolts at the rear of the plenum) that the throttle cable goes to as part of the plenum removal process. I would strongly advise that you reconnect this BEFORE bolting this plate back on. I forgot & wasted quite a bit of time trying to hook it back on before admitting defeat & unbolting the plate again!"
Be sure to use a good quality fuel hose suitable for fuel injection systems. A local-to-me 'specialist fuel injection' garage tried to sell me a length of the fabric covered hose. A quick check of Its codan code - which is printed on the hose - produced "Must not be used in cars with injection systems".
"Have a read through this - appreciate its Jaguar.
http://www.jag-lovers.org/xj-s/book/EFIhoseclamps....
Covers the type of injector also found on the RRC EFi where there is no clamp at the bottom of the hose on the injector but what looks like a small cup - referred to as a dished washer in the link. This is what it is, it isn't clamped onto the hose. There are only clamps at the fuel rail end.
Done this job on mine - 1986 3.5EFi - & this is what I did.
You will need to remove the plenum & ram housing. No need to remove the injectors but I did disconnect their electrical connectors to give a bit more room.
I removed the old hoses by the soldering iron method outlined in the link although I used it to cut into the side of the pipe - used the same thing to release the top end of the hose where it joins the steel pipe. Makes life much easier getting it off & doesn't risk damage as using a knife could although may take a bit longer.
Put the cup onto the injector then pushed the new hose - 5/16" - over the barbs & into the cup.
Refitted the fuel rail, clamped it all up using proper fuel hose screw clamps (not the worm drive type) & tested for leaks prior to refitting the ram housing & plenum. Easy to test with a flapper as you just need to turn the ignition on & push the flap open to start the pump.
ETA. There is a small throttle spring which holds the two parts of the throttle spindle in contact that you need to detach when removing the plate (held on with two bolts at the rear of the plenum) that the throttle cable goes to as part of the plenum removal process. I would strongly advise that you reconnect this BEFORE bolting this plate back on. I forgot & wasted quite a bit of time trying to hook it back on before admitting defeat & unbolting the plate again!"
Be sure to use a good quality fuel hose suitable for fuel injection systems. A local-to-me 'specialist fuel injection' garage tried to sell me a length of the fabric covered hose. A quick check of Its codan code - which is printed on the hose - produced "Must not be used in cars with injection systems".
Edited by paintman on Thursday 7th December 20:40
Splendid info there thanks very much.
As an update for others I tried replacing a hose today and found that unlike the Jag injectors that have a plastic barbed fitting where the hose fits the RV8 ones are ali which means you do not have to be quite as careful not to cut or damage plastic when trying to remove the old hose. Whilst doing this I found particles of probably dried fuel etc in the top of the injector which is not good plus it takes quite a time to carefully remove the old hose so as a business it is not cost effective. That injector company will clean,service, test and replace the hoses for £16.80 each so that is what we will advise the customer.
Thanks again
Steve
As an update for others I tried replacing a hose today and found that unlike the Jag injectors that have a plastic barbed fitting where the hose fits the RV8 ones are ali which means you do not have to be quite as careful not to cut or damage plastic when trying to remove the old hose. Whilst doing this I found particles of probably dried fuel etc in the top of the injector which is not good plus it takes quite a time to carefully remove the old hose so as a business it is not cost effective. That injector company will clean,service, test and replace the hoses for £16.80 each so that is what we will advise the customer.
Thanks again
Steve
You're quite right, the RRC ones are indeed ali.
If I was going to do mine again I'd still use the soldering iron with pointed tip as there is no risk of damage & as the hoses aren't clamped I'd rather not risk it.
My hoses were ancient & one was slightly damp with fuel I so did all the fuel rail hoses. IIRC including tea breaks took me just over half a day.
If I was going to do mine again I'd still use the soldering iron with pointed tip as there is no risk of damage & as the hoses aren't clamped I'd rather not risk it.
My hoses were ancient & one was slightly damp with fuel I so did all the fuel rail hoses. IIRC including tea breaks took me just over half a day.
Edited by paintman on Friday 8th December 14:10
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