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low pressure fuel pump vs High pressure fuel pump

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Old 07-31-2015, 09:06 AM
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low pressure fuel pump vs High pressure fuel pump

What would be the symptoms of running a rx8 with a cheap low pressure fuel pump ,

As I have a issue , my car starts fine at any time without hesitation , but it wont start at all like no compression for like 2 minutes if I switch off the car after flooring it like hell..
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Old 07-31-2015, 09:13 AM
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Why do you think that this is a fuel pump problem?

The only time I see trouble starting being a fuel pump problem is if the car dies while you are actively driving it at speed in gear, like on the highway, and then won't start for ~20 minutes then suddenly starts fine.

All other starting difficulty descriptions end up being something else.
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Old 07-31-2015, 09:20 AM
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Originally Posted by RIWWP View Post
Why do you think that this is a fuel pump problem?

The only time I see trouble starting being a fuel pump problem is if the car dies while you are actively driving it at speed in gear, like on the highway, and then won't start for ~20 minutes then suddenly starts fine.

All other starting difficulty descriptions end up being something else.
I suspect the pump sir because, its a cheap low pressure pump I puted into my assembly till my new pump come.

car just starts fine if I drive normal for hours. it will start right away without any hesitation. only issue is if I floor it hard the car struggles to start up .
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Old 07-31-2015, 09:30 AM
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Ah, I didn't catch that you installed a cheap pump. I'd recommend putting in a good/correct pump. If you run into fuel pressure drop from reving hard, actually driving it hard puts you at significant risk of engine damage from a lean spike with that pressure drop.

Get a proper pump in there. A $150 pump is cheaper than a $3,300 engine.
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Old 07-31-2015, 09:47 AM
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Originally Posted by RIWWP View Post
Ah, I didn't catch that you installed a cheap pump. I'd recommend putting in a good/correct pump. If you run into fuel pressure drop from reving hard, actually driving it hard puts you at significant risk of engine damage from a lean spike with that pressure drop.

Get a proper pump in there. A $150 pump is cheaper than a $3,300 engine.

Yes sir I already ordered a high pressure pump ,

and sir does a low pressure fuel pump can cause this issue to me ?
this starting isuue after driving hard ?
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Old 07-31-2015, 09:49 AM
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I can't say for sure without some fuel pressure readings when you are trying to start.

Frankly, you are the first person I've see on the forums try a low pressure fuel pump.
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Old 07-31-2015, 09:57 PM
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Originally Posted by RIWWP View Post
I can't say for sure without some fuel pressure readings when you are trying to start.

Frankly, you are the first person I've see on the forums try a low pressure fuel pump.

Sir my issue have changed in to a different section of the car .
I randomly bumped in to the previous owner of the car and seems to be he have also had the same problem earlier . and the issue was with the throttle body , he have cleaned it and all have become normal agin , he told it was blocked back then .
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