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1999 S70 NA Hard Starting after fill-up

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1999 S70 NA Hard Starting after fill-up

Post by kumulipo » Mon Oct 01, 2018 7:33 pm

My 1999 s70 n/a has a hard time starting after a fillup, either automatically by the pump, or manually before the tank is full.
Tank is NOT topped off.
Engine will start but must maintain revs 3000+ to run.
Once underway, no problems.
Your thoughts, please.

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Re: Hard Starting after fill-up

Post by misha » Tue Oct 02, 2018 3:48 am

You are getting raw fuel into intake through carcoal canister.
It could be because of tank ventilation system failure.
If it does that always it would be fuel pressure regulator leaking fuel through vacuum line.
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Re: Hard Starting after fill-up

Post by ecbsykes » Tue Oct 02, 2018 5:34 am

Any codes that are coming up?
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Re: 1999 S70 NA Hard Starting after fill-up

Post by abscate » Tue Oct 02, 2018 6:29 am

No FPR on a 1999 with ME7 - but the overloaded EVAP canister is almost certainly it.

It moved to the rear passenger floor area, just in front of tire, in late 1998

Added year model to title per forum rules
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Re: 1999 S70 NA Hard Starting after fill-up

Post by misha » Tue Oct 02, 2018 6:44 am

abscate wrote:
Tue Oct 02, 2018 6:29 am
No FPR on a 1999 with ME7 ...
Not even integrated in fuel pump housing/assembly?
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
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Re: 1999 S70 NA Hard Starting after fill-up

Post by abscate » Tue Oct 02, 2018 7:19 am

YEs, fuel pressure is regulated there, but without a vacuum line. It is electronically regulated by feedback from the fuel pressure sensor. I dont think that will cause the symptoms reported here.
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Re: 1999 S70 NA Hard Starting after fill-up

Post by misha » Tue Oct 02, 2018 7:29 am

P2 models have the same set up too...at least early ones...2000-2002.
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
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'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Re: 1999 S70 NA Hard Starting after fill-up

Post by abscate » Tue Oct 02, 2018 7:40 am

misha wrote:
Tue Oct 02, 2018 7:29 am
P2 models have the same set up too...at least early ones...2000-2002.

I think it is

1992-1998 P80 Vacuum operated FPR - some on fuel rail, some on power steering rack (years/models?)

199-2001 Bastard FPR electronically regulated, fuel pump relay in fusebox, fuel pressure sensor ?

2002-2008 relay on CEM, CEM drives PEM with a signal, PEM drives fuel pump with another signal - fuel pressure measured on rail
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Re: 1999 S70 NA Hard Starting after fill-up

Post by kumulipo » Tue Oct 02, 2018 12:31 pm

Thanks for all your help.
Will post codes next time it happens.
I'm remembering P0405. That's not reliable.
So my repair would be the carbon cannister plus associated hosing? Plus checking the fuel rail situation?
Between fillups it starts easily.
Thanks again!

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Re: 1999 S70 NA Hard Starting after fill-up

Post by misha » Tue Oct 02, 2018 3:34 pm

You must find the reason why carbon canister is flooding...not replacing it.
Doing that you will not solve nothing.
These users thanked the author misha for the post:
kumulipo
'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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