What is it?

1340 Views 9 Replies 4 Participants Last post by TimAT, Sep 12, 2012

minkus316

Discussion Starter · Sep 6, 2012

I have something on the passenger front of my engine, down low that looks like it has a fuel line running into it and then out to a Holley double pumper. Both input and output is at the bottom on the item. Is this a fuel pump of some sort? It looks like it might have oil running to it through the engine and is just a bit smaller than the oil filter in size. I changed the oil today and was checking to leaks afterwards and saw this moving like crazy then realized that this piece was missing 1 of the 2 bolts that held it on and the other was about 1/2 way out! Yikes!

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minkus316

Discussion Starter · #2 · Sep 7, 2012

:toilet: Well, there goes any credibility that I had with the group. My neighbor explained to me that it is indeed a fuel pump and that there is a arm that gets driven by the crank shaft (?) in the engine and probably where I am loosing some oil. He gave me a bolt that fit and I got it tightened back up. Maybe that's why it was hesitating when going around corners sometimes...

Rookie mistake, learning.

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minkus316

Discussion Starter · #3 · Sep 7, 2012

I'd also add that those bolts are a booger to get at between the cooling system hoses and headers.

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toobroketoretire

· #4 · Sep 7, 2012

minkus316 said:
:toilet: Well, there goes any credibility that I had with the group. My neighbor explained to me that it is indeed a fuel pump and that there is a arm that gets driven by the crank shaft (?) in the engine and probably where I am loosing some oil. He gave me a bolt that fit and I got it tightened back up. Maybe that's why it was hesitating when going around corners sometimes... Rookie mistake, learning.

The fuel pump is driven by a 1/2" diameter steel rod that gets shoved by a lobe on the camshaft.

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[email protected]

· #5 · Sep 7, 2012

yeah, thats the fuel pump alright

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minkus316

Discussion Starter · #6 · Sep 11, 2012

Is the mechanical fuel pump a pretty robust system, or do people generally move to electric fuel pumps when they are working over a C3?

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toobroketoretire

· #7 · Sep 11, 2012

minkus316 said:
Is the mechanical fuel pump a pretty robust system, or do people generally move to electric fuel pumps when they are working over a C3?

The mechanical pumps are very reliable and usually last many years

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[email protected]

· #8 · Sep 11, 2012

I run a Holley mechanical pump to feed my 525 HP stroker... never had any issues ..

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toobroketoretire

· #9 · Sep 11, 2012

[email protected] said:
I run a Holley mechanical pump to feed my 525 HP stroker... never had any issues ..

I recently found out all mechanical pumps aren't equal as I had a "Pierce" pump fail on me from the very beginning. So always buy a major brand name pump; a LEAST an AC Delco.

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TimAT

· #10 · Sep 12, 2012

I'm feeding a crate LS-7 big block with a mechanical pump- It'll probably die next time I drive it, but it's the pump that came on the car in 1969.......but I'll swear I never said that.

wnedbutton:

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