Fuel pressure drop

[Tman75]

Please need help. My 87GN starts stalling at 10lbs of boost. I noticed fuel drop from 50 to 40 after driving(vacuum off) and with vacuum on approx 40 to 30. Any advise will be appreciated.

 

[Pronto]

Pump is dying or the rubber hose in connecting the pump to the sending unit has a split. Could also be the regulator. Pull the vacuum line and see if its got gas in it.
Why is the fuel pressure at 50 with the line off to begin with?

 

[Tman75]

Dont know why had it originally at 43 vacuum off and one day I started it and it was 50. Ill check those things a newbie at this appreciated it. Also pump and regulator or only two months old. Still think it could be that?

 

[earlbrown]

New doesn't mean anything anymore. Proven is the new black.

 

[Tman75]

New doesn't mean anything anymore. Proven is the new black.

New doesn't mean anything anymore. Proven is the new black.

 

[Tman75]

I know your right I just can't believe it something that they say is good (accufab /walbro 255) wow I guess I have to up grade fuel pump to something better I'm assuming thanks though

 

[earlbrown]

Assuming parts are good just because they're new can lead you waaaaaaaaaaay down the wrong rabbit hole. It's always best to verify, that way (to quote Marsellus Wallace) you know. You don't want to think, you want to know.


It doesn't have to be the pump, or the FPR. It can be other things too. Do you know for sure you aren't running the pulsator on the pump hanger and have the correct 30R10 piece of hose in it's place?

It might be a cheap fix once you get a replacement hose if that's the case.

 

[Tman75]

Will do I'm a newbie to all this had my car over two years complete stock just started to mess with it so appreciate the advice

 

[earlbrown]

If it's complete stock, you need to ahead and order a fuel pump and a hotwire kit to power it.

There's other stuff you need to take care of too.

 

[Tman75]

Yes when I purchased the fuel pump and reg I also got hotwire also tt chip and 60 lbs inj I'm thinking it could be I'm the connections not really sure since I wasn't the one who installed it just installed scanmaster so this weekend going to study the codes and see if I can trouble shoot I'll keep post it really appreciate

 

[Tman75]

Also maybe a bigger fuel pump or just add another pump

 

[Pronto]

I something that they say is good (accufab /walbro 255) wow I guess I have to up grade fuel pump to something better I'm assuming thanks though

Ah, new Accuflub....