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Old 04-20-2017, 09:32 AM   #51
kk88rrc
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Default Re: Poor MPG follow on

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Originally Posted by AbnMike View Post
Manofspacebob: I posted my fuel pressure stats somewhere and no one said they seemed low. However the regulator is the only thing I haven't replaced.
Someone mentioned it seemed low back on post #38.

Have you pulled the vac hose off the FPR & check for any gas?
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Old 04-20-2017, 10:00 AM   #52
AbnMike
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Originally Posted by kk88rrc View Post
Someone mentioned it seemed low back on post #38.

Have you pulled the vac hose off the FPR & check for any gas?
Check for gas how? I've had the vac hose off to test the pressure and it jumps up as others said it should.
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Old 04-20-2017, 12:14 PM   #53
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Check for gas how? I've had the vac hose off to test the pressure and it jumps up as others said it should.
It's to check the condition of the diaphragm in the FPR. If gas is present in hose or coming out of regulator, then the FPR is bad.

You're pressure jumping above 100psi can't be good.
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Old 04-20-2017, 12:37 PM   #54
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Quote:
Originally Posted by kk88rrc View Post
It's to check the condition of the diaphragm in the FPR. If gas is present in hose or coming out of regulator, then the FPR is bad.

You're pressure jumping above 100psi can't be good.
I don't recall there being fuel when I removed the vac hose.

What should it do when I clamp the return line?
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1996 Discovery SD
1983 Husqvarna 250 WR
1969 Lambretta 200dl
1971 Suzuki TS250
1986 Honda tlr 200

(I like old, unreliable stuff that keeps me from spending too much time surfing porn)
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Old 04-20-2017, 03:18 PM   #55
kk88rrc
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Default Re: Poor MPG follow on

I do not know exact number but last time I tested mine it was 40 ignition on and 50 at idle with return line clamped. Also, the fact that your pressure drops from ignition on at 38psi to running at 2500rpm with 25psi doesn't look good. Age of fuel pump & filter?
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Old 04-20-2017, 05:43 PM   #56
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Originally Posted by kk88rrc View Post
I do not know exact number but last time I tested mine it was 40 ignition on and 50 at idle with return line clamped. Also, the fact that your pressure drops from ignition on at 38psi to running at 2500rpm with 25psi doesn't look good. Age of fuel pump & filter?
Both are brand new.
__________________
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1996 Discovery SD
1983 Husqvarna 250 WR
1969 Lambretta 200dl
1971 Suzuki TS250
1986 Honda tlr 200

(I like old, unreliable stuff that keeps me from spending too much time surfing porn)
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Old 04-20-2017, 10:46 PM   #57
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Default Re: Poor MPG follow on

Start it up and pull the vacuum line off and plug it, then wait a few minutes (it may take while), and see if gas drips from the regulator. if so, it's shot and needs replaced (about a $50 item).
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Old 04-24-2017, 09:05 AM   #58
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Start it up and pull the vacuum line off and plug it, then wait a few minutes (it may take while), and see if gas drips from the regulator. if so, it's shot and needs replaced (about a $50 item).
I let it sit with the line off and plugged after a drive - and it probably sat for 5-10 mins. No leaks I could see.
__________________
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1996 Discovery SD
1983 Husqvarna 250 WR
1969 Lambretta 200dl
1971 Suzuki TS250
1986 Honda tlr 200

(I like old, unreliable stuff that keeps me from spending too much time surfing porn)
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