Hi all May I get some help please.
1986 normally aspirated 944. Going through one of those starts then stops phase. I’ve changed due relay etc. just looking at the fuel pressure damper on front of fuel rail. If I remove the vacuumed hose and suck on it, it responds but slowly the vacuum I’ve created releases. should it hold that vacuum until I release it??
thanks in advance.
bremar.
How do I Test the fuel pressure damper?
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BrettandSam
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stratfordshark
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Re: How do I Test the fuel pressure damper?
Should hold vacuum. If diaphragm failed then you should also be able to suck fuel from vacuum port, so use clear hose on MityVac to spot this.
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mikesred 2
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Re: How do I Test the fuel pressure damper?
did you get sorted?
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Wh1t3Kn1ght
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Re: How do I Test the fuel pressure damper?
Have you checked fuel pressure and performed a leak down test etc?BrettandSam wrote:Hi all May I get some help please.
1986 normally aspirated 944. Going through one of those starts then stops phase. I’ve changed due relay etc. just looking at the fuel pressure damper on front of fuel rail. If I remove the vacuumed hose and suck on it, it responds but slowly the vacuum I’ve created releases. should it hold that vacuum until I release it??
thanks in advance.
bremar.
As others said pretty easy to spot if the FPR or damper is busted as you will get fuel in the vacuum line.
Not sure that a dodgy damper would cause an issue as I've known some people delete the damper, more likely the FPR or fuel pump?