Fuel Pressure ????? Help

EMM · Jan 22nd, 2010, 21:21

Hi All i have been having a few issues or 'Gremlins' in the system.

Its odd, only until the cold weather have i had the issue. When i start my volvo a week or so ago it took a 2minute pump then it fired up. It would idle fine, but if i put it under load between 1,000 - 2,000rpm it would stall unless i caught it.

So stopped and turned the key off. Big mistake. Took at least 30minutes to get going but then the problem just disappeared.

So fired up next day no problem. Tried 4 days later problem was back again but now i cranked the engine and just before the bat died it almost fired.

So went back and turned the key from pos 1-2 about 10 times and it started just (then the bat died and engine cut out).

My question is - could the regulator not be holding fuel so it is draining back into the pump, so by turning the pump on and off its putting fuel back into the system?

I don't think it's the relay as the pump is quite and primes with no problems, i have spark, coil is outputting 12 v and bat is 12.6 volts norm/13-15 volts when running.

charlotte001 · Jan 22nd, 2010, 21:22

is the fuel getting to the injectors ?

EMM · Jan 22nd, 2010, 21:30

Going to ask a really dumb question where are the injectors and how can i see if fuel is getting to them?

Cheers
Andy

charlotte001 · Jan 22nd, 2010, 21:33

you will find them bolted to the top of the engine fitted to a rail of some kind, there will be 4 or 5 of them depends how many cylinders you have. Oh what car do you have too that will help loads? DO NOT remove them and put your finger over the end to see if fuel comes out but remove one from the rail turn the ignition on to see if theres fuel [you will need lots of rags]

You cant miss them they may be under a cover brightly covered with an eletrical socket on them with a fuel pipe connected to each.

storming · Jan 22nd, 2010, 21:38

have yoiu tried another fuel relay, they are cheap and easy to replace and the usual problem with fueling you describe.

EMM · Jan 22nd, 2010, 21:40

Cheers i will have a look tomorrow. sorry to ask - last car i worked on was an SJ413, so big step up.

I am assuming that on start up the injectors squirt fuel into the cylinder. So if these have no fuel or the fuel is drained at the back to the tank these will be skirt small amounts of fuel into the engine not allowing it to start.

So if i have a fuel system problem i am expecting to see a small bit of fuel to begin with then alot of fuel as the fuel is forced through the line.

However if it squirts fuel every where my search goes on.

Ow would a fuel pressure test help?

Cheers
Andy

EMM · Jan 22nd, 2010, 21:44

I haven't tried the fuel pump relay, but i assumed if the relay had gone i won't be able to get it started at all, where as prolong crank will get it started but i could be wrong.

Cheers
Andy

Jan 22nd, 2010, 21:21	#1
EMM Senior Member Last Online: Yesterday 21:31 Join Date: Jan 2010 Location: Cheltenham	Fuel Pressure ????? Help Hi All i have been having a few issues or 'Gremlins' in the system. Its odd, only until the cold weather have i had the issue. When i start my volvo a week or so ago it took a 2minute pump then it fired up. It would idle fine, but if i put it under load between 1,000 - 2,000rpm it would stall unless i caught it. So stopped and turned the key off. Big mistake. Took at least 30minutes to get going but then the problem just disappeared. So fired up next day no problem. Tried 4 days later problem was back again but now i cranked the engine and just before the bat died it almost fired. So went back and turned the key from pos 1-2 about 10 times and it started just (then the bat died and engine cut out). My question is - could the regulator not be holding fuel so it is draining back into the pump, so by turning the pump on and off its putting fuel back into the system? I don't think it's the relay as the pump is quite and primes with no problems, i have spark, coil is outputting 12 v and bat is 12.6 volts norm/13-15 volts when running.

Jan 22nd, 2010, 21:22	#2
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	fuel is the fuel getting to the injectors ? __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jan 22nd, 2010, 21:33	#4
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	help you will find them bolted to the top of the engine fitted to a rail of some kind, there will be 4 or 5 of them depends how many cylinders you have. Oh what car do you have too that will help loads? DO NOT remove them and put your finger over the end to see if fuel comes out but remove one from the rail turn the ignition on to see if theres fuel [you will need lots of rags] You cant miss them they may be under a cover brightly covered with an eletrical socket on them with a fuel pipe connected to each. __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jan 22nd, 2010, 21:38	#5
storming Senior Member Last Online: Jun 10th, 2015 21:02 Join Date: Sep 2008 Location: bristol	relay have yoiu tried another fuel relay, they are cheap and easy to replace and the usual problem with fueling you describe.

Jan 22nd, 2010, 21:30	#3
EMM Senior Member Last Online: Yesterday 21:31 Join Date: Jan 2010 Location: Cheltenham	Going to ask a really dumb question where are the injectors and how can i see if fuel is getting to them? Cheers Andy

Jan 22nd, 2010, 21:40	#6
EMM Senior Member Last Online: Yesterday 21:31 Join Date: Jan 2010 Location: Cheltenham	Cheers i will have a look tomorrow. sorry to ask - last car i worked on was an SJ413, so big step up. I am assuming that on start up the injectors squirt fuel into the cylinder. So if these have no fuel or the fuel is drained at the back to the tank these will be skirt small amounts of fuel into the engine not allowing it to start. So if i have a fuel system problem i am expecting to see a small bit of fuel to begin with then alot of fuel as the fuel is forced through the line. However if it squirts fuel every where my search goes on. Ow would a fuel pressure test help? Cheers Andy

Jan 22nd, 2010, 21:44	#7
EMM Senior Member Last Online: Yesterday 21:31 Join Date: Jan 2010 Location: Cheltenham	I haven't tried the fuel pump relay, but i assumed if the relay had gone i won't be able to get it started at all, where as prolong crank will get it started but i could be wrong. Cheers Andy

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