Hard start - Dealer rip off? - Fuel check valve location?

V70rG · Post by **V70rG** » 13 Dec 2014, 02:28

Hello, I have a Volvo 2000 V70R (USA version). I have a issue with the car requiring 3 to 6 seconds while turning the key before it starts. Then it runs great. The dealer, Galpin Volvo, replaced the 'fuel pipe' which is the hard fuel line and fuel pressure regulator, part #9445512, a few weeks ago. This didn't solve the problem. I have been told by a few people that the 2000 V 70R all-wheel-drive, has a 'check valve' connected to the fuel pump and that this could be my problem. When I asked the technician at the dealership he said that the 2000 V 70 R all-wheel-drive does not have a 'check valve' with the pump assembly. That the 'check valve' is part of the fuel pressure regulator fuel pipe line. Since he just replaced that part, he said it was probably a bad part. He wants to order another fuel pressure regulator -fuel pipe line and install that again. Could you please tell me, is there a fuel check valve connected to the pump assembly? This technician says no, every other person I speak to says yes. Would replacing the pump assembly therefore solve my problem I am I'm being told by many other people? I did my pump at this dealership before and the warranty runs out in a few weeks. That is why if it can be repaired by the pump assembly I want them to do it. But they are resisting. Thank you

Post by **precopster** » 13 Dec 2014, 04:13

The parts list at FCP Euro show the 2000 fuel pump as a different part number to the 98 or 99 model. The 2000 model has the fuel pressure regulator on the underside of the fuel rail near the injectors and it's shaped like a round disc about 50mm wide.

Post by **cn90** » 13 Dec 2014, 06:35

Dealer is probably wrong.
Tons of info in forum.
The problem with AWD version is the access to fuel pump.
Some drop the fuel tank and some cut a hole to access the fuel pump.

Options:
1. Install separate check valve.
2. Replace Fuel Pump (see posts by Ozark Lee) with another Walbro.

Post by **northernlights** » 13 Dec 2014, 06:50

If they have replaced a fuel pump before, plus this part, it seems like somebody is guessing.

I think fuel delivery problems are often misdiagnosed because of hidden issues that make the ECU either deliver less fuel or no fuel before it goes into closed loop.

Question #1 - Does it seem to be temperature related, i.e. it got worse when it got colder?

Question #2 - Are warm restarts easier than cold starts?

Question #3 - Does it crank freely for the 3-6 seconds before it catches? If an engine has no fuel or no ignition then it spins much easier than if it is getting even some fuel and spark. Gasoline wants to explode!

Post by **jimmy57** » 13 Dec 2014, 08:00

The second hose with regulator assembly will be warranted, parts and labor, if it was done less than a year ago (Volvo parts warranty is one year until 6-7 months back when it was extended to two years).
But it is not likely that is the problem. There is a check valve built into the fuel pump. The fuel outlet nipple of the pump contains a spring pushing a ball onto a seat. When the pump pushes out fuel it moves ball off seat against the spring and when pump power is shut off the spring pushes ball on seat and seals.
The relocation of the regulator to the line in rear was to reduce fuel heating. Heated fuel vaporizes more and can produce more vapor than the charcoal canister can absorb. The vapors are an emission that was limited to a smaller amount so reducing fuel temp was the way it was addressed. No fuel returns from engine area so it is not exposed to heat. The system still has to have a pump mounted check valve or fuel will drain out of line back into tank. Fuel pressure regulator is the other way the fuel can drain and get back to tank. The fuel leaves pump goes through filter and after filter is a T fitting with one hose going to engine and the other goes to the fuel pressure regulator. The T fitting can be where the regulator is mounted, I can't remember if it is that way on a 2000 AWD. It is likely one with the T fitting having the regulator and they think it has no check valve since it looks like the fuel has to pass through the regulator. That is still a fuel relief type regulator as the relieved fuel is used to lift the LH tank fuel over to the RH side of tank.