250 I6 Monojet Fuel Pressure Requirements - The 1947 - Present Chevrolet & GMC Truck Message Board Network

grancuda · 03-12-2009, 04:31 PM

Anyone know what a '72 Rochester Monojet fuel pressure should be? I put a 3/8 line all the way up and a holley electric pump on for when I do my LS swap and it is making my carb run funky. It is putting out 7-8 psi and I think the Monojet should should be 4-5 but can't find that anywhere. I am planning on getting a regulator for it but need to know the pressure I need to shoot for first.

68gmsee · 03-12-2009, 04:55 PM

Here's some info for later sixes but it should be about the same.

http://www.73-87.com/7387garage/drivetrain/fuelpump.htm

connors69 · 03-12-2009, 06:04 PM

Can't say for sure for a '72 however, the factory manual for my '69 states that it should be 3 to 4 1/2 psi for the 250. As far as volume, it should push out 1 pint in 30-45 seconds.

jakesblazer · 01-03-2016, 02:23 PM

How do you test fuel pressure on the 250 l6? Can you just turn it over or does it have to run?

03-12-2009, 04:31 PM	#1
grancuda Registered User Join Date: Nov 2007 Location: Central OK Posts: 396	250 I6 Monojet Fuel Pressure Requirements Anyone know what a '72 Rochester Monojet fuel pressure should be? I put a 3/8 line all the way up and a holley electric pump on for when I do my LS swap and it is making my carb run funky. It is putting out 7-8 psi and I think the Monojet should should be 4-5 but can't find that anywhere. I am planning on getting a regulator for it but need to know the pressure I need to shoot for first.

03-12-2009, 04:55 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: 250 I6 Monojet Fuel Pressure Requirements Here's some info for later sixes but it should be about the same. http://www.73-87.com/7387garage/drivetrain/fuelpump.htm

03-12-2009, 06:04 PM	#3
connors69 Registered User Join Date: May 2007 Location: Snohomish, WA Posts: 5	Re: 250 I6 Monojet Fuel Pressure Requirements Can't say for sure for a '72 however, the factory manual for my '69 states that it should be 3 to 4 1/2 psi for the 250. As far as volume, it should push out 1 pint in 30-45 seconds.

01-03-2016, 02:23 PM	#4
jakesblazer Registered User Join Date: Dec 2015 Location: new Hartford ny Posts: 51	Re: 250 I6 Monojet Fuel Pressure Requirements How do you test fuel pressure on the 250 l6? Can you just turn it over or does it have to run?



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