Still starved of fuel
#1
Still starved of fuel
Vented cap, new fuel filter, cleaned sump and filter. Now starved shortly after start up and used to take 20 minutes or so. Fuel pump operating but does make a whirring, slightly whining sound. Is the pump starting to fail? Will it fail gradually or all at once? Or is it fuel pressure valves? Any suggestions before I put in a new fuel pump?
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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#3
As Doug said.
The RH FPR is really used as a pulse damper, and has no actual "pressure" use. If it fails, and most do, it can jam shut, or partially open, and ceasation of engine running, or starvation is teh result.
The pumps do make a whirring sound, but in the big scheme of things barely audible. A few of mine have been noisier than others, and have lasted years, one (the HE) made a wierd screech and died within 30kms.
Age is niw a factor in anything on these cars.
Have a peek at the fuel line, where it enters the engine bay, on the RH side. SOME V12's have an adaptor/one way valve in the hose at this point. REMOVE it, as they also jam. I am not sure of your market, but we had them in the mid to late '80's.
The RH FPR is really used as a pulse damper, and has no actual "pressure" use. If it fails, and most do, it can jam shut, or partially open, and ceasation of engine running, or starvation is teh result.
The pumps do make a whirring sound, but in the big scheme of things barely audible. A few of mine have been noisier than others, and have lasted years, one (the HE) made a wierd screech and died within 30kms.
Age is niw a factor in anything on these cars.
Have a peek at the fuel line, where it enters the engine bay, on the RH side. SOME V12's have an adaptor/one way valve in the hose at this point. REMOVE it, as they also jam. I am not sure of your market, but we had them in the mid to late '80's.
#4
#5
#6
Blew compressed air through supply side fuel line. The pump has 12 volts. Started it up and no problem this time for about 15 minutes and a 5 mile test run. Let it run, parked, and then started to stall on acceleration during second test run. I do not have a fuel pressure gauge. I will order a new rh FPV. The fuel pump can be heard running from inside the car. Is it time for a new one also?
#7
Definately a female Jag.
I would strongly suggest removing the RH FPR, and save the money for something else.
That pump is very high on my to do list. If that is audible inside the car it is waaaay past replacement time.
I also suggest doing a test run with the fuel cap not fitted. Obviously a FULL tank of gas is not a good idea here. This proved successful to one I was chasing stalling on, so a 1/32" hole, dead centre in the cap sorted that car well.
I would strongly suggest removing the RH FPR, and save the money for something else.
That pump is very high on my to do list. If that is audible inside the car it is waaaay past replacement time.
I also suggest doing a test run with the fuel cap not fitted. Obviously a FULL tank of gas is not a good idea here. This proved successful to one I was chasing stalling on, so a 1/32" hole, dead centre in the cap sorted that car well.
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#8
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Grant Francis (04-11-2014)
#9
Just installed new fuel pump and the problem is worse. I seem to have air at the rail when I loosened the fitting. Did this a couple of times to try and bleed it out. It still wont get enough fuel. Should I be looking at something different than fuel supply? Would it be sucking air even though I checked and could not locate it? Deleted RH FPV. No in line one way valve. Blew compressed air through supply line. Cleaned sump and filter. New fuel filter and fuel pump. Could this be an air or ignition issue? It stalls, sputters, some backfiring.
#10
Sent you a PM a few minutes ago, with some suggestions.
The EFI is self bleeding, so you have no control over that.
I am thinking ign coil/s, ign module, or that PITA coax wire to pin #18 of the ECU. The backfiring is my lead there, but also a very lean mixture, etc etc will also give that, but at the moment I am trying to keep it to simple items, not knowing the history of the car.
The TPS could also be dying, and that would confuse the ECU something serious.
The EFI is self bleeding, so you have no control over that.
I am thinking ign coil/s, ign module, or that PITA coax wire to pin #18 of the ECU. The backfiring is my lead there, but also a very lean mixture, etc etc will also give that, but at the moment I am trying to keep it to simple items, not knowing the history of the car.
The TPS could also be dying, and that would confuse the ECU something serious.
#11
#12
I think I found it.
Fuel isn't getting from the tank to the sump. By accident, I pulled a little on the rubber hose and could hear fuel rush into the sump. I figure the lining of the hose is deteriorating and causing blockage. I will replace asap. Thanks to everyone for the help. I now have a new, not needed, fuel pump but at least the old is a serviceable spare. Can't have too many spare parts I think.
#13
Yep, put the spare pump in the boot (trunk) and you will NEVER need it.
Put it in the box in the shed, and you WILL need it far from home.
Our XJ12 had a starter jamming issue some times, so a 1" socket onn a bar lived in teh boot, rarely used it, but it was there.
Spouse cleaned the boot out, socket and all, so next outing, starter jammed, went for the socket, &^%%$$##@@, she never touched the boot again.
Put it in the box in the shed, and you WILL need it far from home.
Our XJ12 had a starter jamming issue some times, so a 1" socket onn a bar lived in teh boot, rarely used it, but it was there.
Spouse cleaned the boot out, socket and all, so next outing, starter jammed, went for the socket, &^%%$$##@@, she never touched the boot again.
#15
If I did it correctly the link will take you to the fuel pump page with about 8 to choose from. I went with the Airtex pump for cost and all necessary bits it came with. I do not know if this is the best pump but has been working nicely for 600 miles.
http://www.rockauto.com/catalog/x,ca...8,parttype6256
http://www.rockauto.com/catalog/x,ca...8,parttype6256
Last edited by Peel86XJS; 06-04-2014 at 07:55 AM.
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