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454 Fuel Pump/Pressures

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CaptJoe3

Member
I have twin 1994 Crusader 7.4 TBIs and am dealing with stall/no start issues on Port engine. We're reading low fuel pressure 5-8 psi. Manual says 16psi min and 20/22 max psi. Why are many on this forum posting their fuel pressure reading "perfect 12psi? And fuel pump pressure is 14-18psi? Any recommendations for best source for 454 electric pump? Prices are all over the place?
 
CaptJoe3 said:
I have twin 1994 Crusader 7.4 TBIs and am dealing with stall/no start issues on Port engine. We're reading low fuel pressure 5-8 psi. Manual says 16psi min and 20/22 max psi. Why are many on this forum posting their fuel pressure reading "perfect 12psi? And fuel pump pressure is 14-18psi? Any recommendations for best source for 454 electric pump? Prices are all over the place?
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Actually fuel pump tested at 30 psi using diesel. Didn't have gas in shop. Will test using gas later today.
 
Do you know why there are so many different opinions on fuel pressures for the pumps on these engines? The specs from the Crusader manual state 16 psi to 20 psi (maybe its 22?) But folks refer to 45 psi as low pressure pumps. Many of the pumps on the market for Crusader don't even state the pressure ratings so you don't know what you're getting.
 
1st, I WOULD NOT buy any Amazon/Chineesium fuel parts. Buy OEM. OEM will be the correct pressure.
2nd, you have a perfectly good engine 3 feet away. You can certainly swap parts 1 at a time until you find the bad 1.
 
OEM
Always if you can find it! I have 2 spare Carter marine fuel pumps for my old 4.3 in the garage. The one thats been on it for the past 8 years is a Sierra that was actually fine passed all the fuel pumps tests in the OMC factory shop manual and puts out 5.5 psi. Just right for a carb engine. So once in a while decent aftermarket works out fine. Only bought that one cause I couldn’t get a Carter when I needed it.
 
louc said:
OEM
Always if you can find it! I have 2 spare Carter marine fuel pumps for my old 4.3 in the garage. The one thats been on it for the past 8 years is a Sierra that was actually fine passed all the fuel pumps tests in the OMC factory shop manual and puts out 5.5 psi. Just right for a carb engine. So once in a while decent aftermarket works out fine. Only bought that one cause I couldn’t get a Carter when I needed it.
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Same here. One of my 1991 Crusader 350 small blocks has the original fuel pump on it and the other has a Carter electric pump. Works great with Rochester quadrajet carbs. Have a spare Carter in case the mechanical on the other engine packs it in. Both pumps bought at NAPA
 
CaptJoe3 said:
Do you know why there are so many different opinions on fuel pressures for the pumps on these engines? The specs from the Crusader manual state 16 psi to 20 psi (maybe its 22?) But folks refer to 45 psi as low pressure pumps. Many of the pumps on the market for Crusader don't even state the pressure ratings so you don't know what you're getting.
Click to expand...
The mid 1990's were very dynamic regarding GM marine engine configurations...mostly driven by the desire to get EFI into the marine domain. The TBI versions, as best as I can tell, came in two flavors - the big difference being the operating fuel pressure.

The sad part is the TBI units had a very short production run (a few years)...so the total number of units made was small and the support demand was proportional. so the remaining supplier base, for parts and knowledge, continues to shrink. Parts will likely be available for a while but at an increasing cost.
 
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