Walbro 525LPH single pump
Walbro 525LPH single pump I know that a Walbro 450LPH will fit the stock pump bucket with a little cutting on the bottom of the bucket, but what about this new 525LPH pump?
131mm long
39mm main housing
50mm lower housing
11mm in
11mm out
131mm long
39mm main housing
50mm lower housing
11mm in
11mm out
If you need that much fuel, the idea of a stock bucket is ludicrous. Even cutting the bucket for smaller pumps is a really bad idea, as it completely negates the idea of a stock fuel bucket. Skimping out on a few hundred in parts and a few hours work on plumbing an adequate fuel system is a good way to spend thousands on a new motor and dozens of hours of work.
If you need that much fuel, the idea of a stock bucket is ludicrous. Even cutting the bucket for smaller pumps is a really bad idea, as it completely negates the idea of a stock fuel bucket. Skimping out on a few hundred in parts and a few hours work on plumbing an adequate fuel system is a good way to spend thousands on a new motor and dozens of hours of work.
If you are pulling the entire fuel tank to do a mini tub kit it would be a perversely wrong hot rodding **** up to not just do a proper return fuel system.
That is the other option. I was planning on doing the C5 filter/regulator kit from Hawks. The future is a resleeved LS2 454 NA. I thought that the stock fuel lines would support that, but I am thinking that just doing a high pressure filter and an adjustable return/regulator at the fuel rail might be a better plan.
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Joined: Jun 2012
Posts: 414
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From: SV, AZ
It's the same pump as the F90000274 drawing more amps to make more flow. It's way more pump than you'll ever need for an NA 454. You don't need to be fancy with your fuel system. Simple is easier and cheaper.
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Brett Foote
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From: Ohio
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From: Ohio
Its inconsistent though. You'll have 70+ at idle, and it will drop back to 58 when you start making power. You end up with a lot of odd circumstances where a given cell in the VE table may not be proper fueling based on fuel pressure.
That just means it won't be linear in the tune. you can still account for the change in fuel pressure. I'm not saying its the theoretical "right" way to do it, just that it can be accounted for.
TECH Regular
Joined: Jun 2012
Posts: 414
Likes: 5
From: SV, AZ
Fuel pressure drop is typically not erratic, it's usually linear unless something is failing. Because it's usually linear, you can compensate for it with the MAF transfer function or VE table. Again, not perfect but it'll work.
TECH Regular
Joined: Jun 2012
Posts: 414
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From: SV, AZ
In a situation where your pump just isn't quite big enough sure. In this situation where you have a regulator not working correctly it's a bigger crapshoot and more likely to be erratic.
Either way it's less than ideal.
Either way it's less than ideal.
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Joined: Mar 2014
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From: Ohio
Works fine for vacuum referenced regulators. If its a static pressure regulator and the PCM has no way to determine that fuel pressure has increased, you're basically leaving it up to fuel trims, etc.
My assumption is that it hasn't already been tuned and you know about it at the time of turning, not that something has changed after the fact. There are plenty of ways to blow a motor if we're talking about something changing after the fact.